K1 Knife comes with replaceable super sharp #11 blades and a snug-fitting safety cap. The precision knife has a special screw for extra blade security and stabilization Use on paper, cardstock, stencils, film, photographs, tape, plastic, wood, cloth, leather, cardboard, cricut, cork, vinyl, foam boards, and most other light-weight crafting This set includes (1) K1 Aluminum Knife with (5) #11 Blade, .31 x 4.75 in - .8 x 12 cm