This craft knife set contains three handles: heavy duty, medium and standard use with 13 interchangeable assorted blades. This set is perfect for cutting a wide variety of materials including cardboard, fabric, leather and plastic. Each blade has a designated usage based on the cut of the blade. The chisel blade can chisel, shave wood, wax and soft plastic. The sharp angled blade is a straight edge that can cut cardboard, plastic, metal and leather. Angled chisel blade can chisel, cut, and trim paper, plastic and wood. Fine precision blade is a straight edge for precision cutting. The curved edge blade is for carving and cutting. The straight edge blade is for paper, wood and leather crafts. Stencil edge blade is for cutting stencils, plastic, wood and leather. Details: 8.85" x 7.68" (22.4cm x 19.5cm) package size 16 pieces Includes a case with a magnetic strip to keep extra blades stored Carbon steel, plastic and aluminum Contents: 3 fine precision blade 3 angled chisel blade 2 chisel blade 2 sharp angled blade 1 curved edge blade 1 straight edge blade 1 stencil edge blade 1 heavy duty knife handle 1 medium use knife handle 1 standard use knife handle WARNING: Blades are very sharp. Wear safety goggles.