Made of high-speed steel, it has fast cutting speed, high hardness and good toughness. The blade is highly polished, and easy to use, and can be used on a variety of leather materials, including vegetable tanned leather and other leather. It is recommended to use a cushion or leather piece to protect the chisel teeth, because it is a consumable. Recommended for leather with a thickness of less than 1 mm. It must be perpendicular to the perforated leather. Do not use a heavy hammer. You can use a plastic hammer or a nylon hammer. Name:Leather knitting machine Colour:Silver Material:steel Size:7mm/8mm/9mm/10mm Package Contents: 4 * Leather knitting machine Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.