Specialist knife and cutlery retail combines technically demanding product specifications (steel grade, hardness, blade geometry) with age-restricted sales (the UK Offensive Weapons Act 2019 restricts knife sales to under-18s), and a passionate customer base of professional chefs and home cooks who are highly knowledgeable about their purchases. WooCommerce knife stores often used custom fields for steel specifications and a custom age verification plugin at checkout. Shopify handles technical specifications through metafields but requires careful configuration for age verification and shipping restrictions.

Knife and kitchen product categories

Chef's knives (Western style): German steel, typically 52–58 HRC, thicker spine, more robust — Wüsthof, Henckels, Mac
Japanese knives: Harder steel (60–67 HRC), thinner blade, sharper edge, more brittle — Shun, Global, Miyabi, artisan/handmade
Knife sets: Block sets for home cooks — block storage, knife roll sets for professionals
Specialist knives: Bread knives, boning, filleting, paring, santoku, nakiri, yanagiba
Sharpening tools: Whetstones, honing rods, pull-through sharpeners, electric sharpeners
Kitchen scissors and shears: Poultry shears, herb scissors, kitchen scissors
Cookware: Frying pans, saucepans, woks, cast iron — material and induction compatibility
Cutting boards: Wood, plastic, end-grain, bamboo — board material matters for knife edge preservation
Kitchen accessories: Knife blocks, magnetic strips, knife rolls, sharpening systems
Knives for other uses: Pocket knives, outdoor/hunting knives, multitools — different age restrictions apply

Knife specification metafields

Blade specifications

product.metafields.knife.blade_steel (single_line_text) — "VG-10", "AUS-10", "X50CrMoV15", "1.4116", "SG2/R2", "ZDP-189", "Aogami Super" — steel grade
product.metafields.knife.hrc_hardness (number_integer) — Rockwell hardness (e.g., 58, 62, 67)
product.metafields.knife.blade_length_mm (number_integer) — blade length in mm (not total length)
product.metafields.knife.blade_thickness_mm (number_decimal) — spine thickness at heel in mm
product.metafields.knife.blade_style (single_line_text) — "German/Western", "Japanese", "Scandinavian/Nordic"
product.metafields.knife.edge_angle_degrees (number_decimal) — factory edge angle per side (e.g., 15° for Japanese, 20° for German)
product.metafields.knife.edge_type (single_line_text) — "Double bevel", "Single bevel (chisel edge)", "Serrated", "Hollow grind"
product.metafields.knife.layers (number_integer) — for Damascus steel: number of layers (e.g., 67, 128)
product.metafields.knife.finish (single_line_text) — "Mirror polish", "Satin", "Hammered (Tsuchime)", "Stone wash"

Handle specifications

product.metafields.knife.handle_material (single_line_text) — "Pakkawood", "Ebony", "Wenge", "Micarta", "G10", "ABS polymer", "Wa-handle (Octagonal)", "Stainless steel"
product.metafields.knife.handle_style (single_line_text) — "Western full-bolster", "Japanese Wa-handle", "Hybrid"
product.metafields.knife.tang (single_line_text) — "Full tang", "Partial tang", "Stick tang" — structural integrity indicator
product.metafields.knife.dishwasher_safe (boolean) — always false for quality knives, but important to display. Dishwasher damages blade edge and handle.

Age verification (UK law)

The UK Offensive Weapons Act 2019 and the Offensive Weapons Act 1996 require that knives (blades over 3 inches, except folding knives with a non-locking blade) cannot be sold to persons under 18:

Online age verification requirement: UK retailers must not sell knives (kitchen knives with blades over 3 inches, pocket knives, outdoor knives) to customers under 18. Verification approaches:
Self-declaration checkbox: "By proceeding I confirm I am 18 or over." This is the minimum approach — widely used but provides no actual verification. Legally acceptable but not robust.
Age verification at delivery: Instruct the courier to request proof of age at delivery. Many carriers (Royal Mail, DPD) offer this service. This is more effective as the ID check happens at point of receipt.
Digital age verification apps: AgeID, Yoti, or Age Checker apps that integrate with Shopify to verify age via ID document scan or credit reference check before purchase. Most robust approach but adds checkout friction.
UK law on restricted knives: Beyond kitchen knives, certain knife types are completely prohibited for sale to the public regardless of age: flick knives, butterfly knives, gravity knives. Do not stock these.
Shopify has no native age gate for specific products — use a Shopify app (Singleton | Age Check, AgeVerify) to apply age verification to knife product pages and at checkout.

Cookware metafields

product.metafields.cookware.material (single_line_text) — "Stainless steel", "Cast iron", "Carbon steel", "Non-stick (PTFE)", "Ceramic non-stick", "Copper", "Hard-anodised aluminium"
product.metafields.cookware.induction_compatible (boolean) — works on induction hobs
product.metafields.cookware.oven_safe_celsius (number_integer) — maximum oven temperature
product.metafields.cookware.dishwasher_safe (boolean) — dishwasher compatible
product.metafields.cookware.pfoa_free (boolean) — PFOA-free non-stick coating
product.metafields.cookware.diameter_cm (number_integer) — pan diameter in cm (for frying pans and woks)
product.metafields.cookware.suitable_hobs (list.single_line_text) — "Gas", "Electric", "Induction", "Ceramic" — compatible hob types

Professional chef lines

Chef vs home cook separation: create separate collections for professional-grade and home-cook products. Chefs buying for daily professional use (12 hours/day) have different requirements from home cooks.
Professional credentials page: highlight endorsements from Michelin-starred chefs or culinary schools if applicable — builds authority for the professional segment
Knife care content: sharpening guides, honing tutorials, and storage recommendations are important content for a knife store. Create a dedicated care guide page linked from all knife product pages.
Custom engraving: some retailers offer engraving on knives and cookware (as a gift option). If offering: create an engraving add-on product or use a custom options app for text input.

Knife and cookware migration checklist

Create knife metafield namespace: blade_steel, hrc_hardness, blade_length_mm, blade_thickness_mm, blade_style, edge_angle_degrees, edge_type, layers, handle_material, tang
Create cookware metafield namespace: material, induction_compatible, oven_safe_celsius, dishwasher_safe, pfoa_free, diameter_cm, suitable_hobs
Migrate WooCommerce knife specification custom fields to Shopify metafields
Install age verification app for knife products (minimum: self-declaration checkbox)
Configure age-at-delivery requirement with courier for knife shipments
Verify no prohibited knife types (flick knives, butterfly knives) are in product catalogue
Create knife collections: Japanese Knives, German/Western Knives, Knife Sets, Sharpening
Create cookware collections: Cast Iron, Stainless Steel, Non-stick, Carbon Steel
Build knife specification display (HRC hardness, steel grade, blade length) in product page template
Enable induction compatibility filter in Search & Discovery for cookware
Create knife care guide page — link from all knife product pages
Test: knife product page shows age verification before add to cart

The steel grade specification is the single most important data element for a specialist knife store — and the one most commonly missing or incorrect after migration from WooCommerce. For knowledgeable customers (professional chefs, knife enthusiasts), the steel grade tells them everything: AUS-10 is hard but not exceptionally so; SG2/R2 is powder steel, extremely hard (63+ HRC), takes a razor edge but chips if used carelessly; Aogami Super is the artisan favourite for reactive high-carbon steel. A knife product page without the steel grade will not convert a knowledgeable buyer — they'll leave to find the specification elsewhere and likely buy from a more complete competitor. Migrate every steel specification from WooCommerce, verify it against manufacturer data sheets, and display it prominently. This single data quality improvement will improve conversion rates among your highest-value customers.

Migrating a knife, cutlery & cookware store from WooCommerce to Shopify (2026)