Made of hardened carbon steel, high durability, strength and efficiency. 15 Pieces includes: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 19mm, 22mm, 25mm. Sharpened cutting edges, knurled non-slip body for secure grip and holding. Safely cut holes on leather belts, watches bands, plastics, paper, gasket, and many more. Suitable for falconry, hobbies, crafts, modeling, home repair etc., Weight: 3.747858454 Pounds, Manufacturer: TOPWAY