High carbon steel 7 point replacement utility knife blades made to fit K13, KS13, K130, RK13 and many other snap off knives.
OLFA 9mm ABB Black Snap Blades - 10 or 50 Pack –
Husky 9 mm Black Snap Knife Blades (10-Pack) SNB-HUS - The Home Depot
Husky 18 mm Serrated Snap Blades (5-Pack) HKY00062 - The Home Depot
Project Source 18mm and 9mm Snap Knife Set 18mm 2-Blade Utility Knife (Snap-Off Blade) 58980
Single Edge Razor Blades 10 pack
Project Source Carbon Steel Utility Razor Blade(10-Pack) in the Replacement Utility Blades department at
Single Edge Razor Blades 10 pack
WORKPRO 100 Pcs SK5 Carbon Steel Utility Knife Blades Replacement with
9mm Utility Knife Blades Replacement, 50 Pcs Snap-Off Blades with a Retractable Utility Knife, Carbon Steel Blades For Vinyl Knife, Box Cutter, Craft Knife, Use in Office, Home, Arts, Crafts