Deli E2057 Heavy Duty Utility Knife Paper Cutter with 18 mm SK5 steel blade and is made of durable Zinc alloy + carbon tool steel. Auto-lock mechanism. Blades snap-off using end cap to provide 8 additional blade segments. Product Dimensions: 155 x 40 x 18 mm (cutter). Blade Dimensions: 0.5 x 18 x 100 mm. Available in Silver Color. Heavy Duty Utility Knife Paper Cutter with 18 mm SK5 steel blade Made of durable Zinc alloy + carbon tool steel. Auto-lock mechanism Blades snap-off using end cap to provide 8 additional blade segments Product Dimensions: 155 x 40 x 18 mm (cutter)