15-35mm (16PC) weight: 740g Specification:15/16/17/18/19/20/21/22/23/24/25/26/28/30/32/35mm About this item: Advanced technology manufacturing and durable material - Made from Cemented Carbide and being hot-treated, the blade is characterized by high accuracy, smooth cutting operation, good resistance to shock and good toughness. High Quality - Small incision resistance, improve the opening speed, chip easy and no tremor. The perforation is neat, smooth, no broken edge. Designed for durability and long life, creates a fine smooth finish. 16Pcs include 16 different boring diameters: 15mm/16mm/17mm/18mm/19mm/20mm/21mm/22mm/23mm/24mm/25mm/26mm/28mm/30mm/32mm/35mm. Wide range of applications - Any wood and wood products, plastic, plywood and other materials you need to exquisite perforation, suitable for industrial hinge installation, wood processing and maintenance, model production, installation of spherical door, drawers and other occasions.