Feature: 1. Forstner drill bit are made of cemented carbide and being hot-treated, high hardness and heat resistant. 2. Make clean cuts with a 15mm, 20mm, 25mm, 30mm, 35mm bit. Suitable for a variety of occasions, perforation on wood products, plastic products, wood and plywood. 3. A depth stop can be fixed on the shank which keeps you from drilling too deep, range from 15mm to 45mm, you can also remove the stop for unlimited depth. 4. X-wing head provides visibility and stability during operation. 5. Suitable for drill press, pistol drill, bench drill, vertical drilling machine, hand held electric drill, stand motor-driven drilling machine and mobile ribbon type magnetism drilling machine etc. Specification: Material type: Tungsten carbide Single length: 78mm Effective depth: 10~40mm Handle length: 27mm No package weight: 360g Wooden box 5PC weight: 485g Wooden box size: 16.5*11*4.5cm Shank diameter: 15mm-(shank diameter 7mm) 20mm-(shank diameter 7mm) 25mm-(shank diameter 7mm) 30mm-(shank diameter 8mm) 35mm-(shank diameter 8mm) Package Include: 1 * 15mm 1 * 20mm 1 * 25mm 1 * 30mm 1 * 35mm 2 * Hex wrench 1 * wooden box