4mm means the distance between the prong, that is, the distance between the center of the hole. We recommend that you use a large weight and size rubber hammer to strike vertically when punching holes, will save your effort. To prevent rusting, you can apply anti-rust oil when not in use.

Package includes 4mm leather hole punch set with 1/2/4/6 claws.Length is 100mm. Please wipe clean the anti-rust oil on the surface of the product before use. 1 prong and 2 prong are used for over bending curve,4 prong and 6 prong are used for straight line. The polished handle is comfortable to hold, and the sharp diamond-shaped teeth help punch holes quickly and easily. Made of white steel, durable handmade leather crafts tools.

Sheet Count: 6. Brand: zeyce. Color: White. Material: Leather. Best Sellers Rank: See Top 100 in Arts, Crafts & Sewing. : B096Z4NGFT. Manufacturer: zeyce. Date First Available: June 10, 2021. Package Dimensions: 5.15 x 4.15 x 0.2 inches; 3.21 Ounces.