Feature: 1. TUNGSTEN CARBIDE: Woodworking hinge hole drilling boring bit is made of premium carbide material, which is strong and durable with long service life. 2. EASY TO USE: Woodworking hinge hole drill bit is easy to install and use, high cutting accuracy, low noise, no burr, and wide range of application. 3. ADJUSTABLE DEPTH: Tungsten carbide wood hole saw auger opener can be adjusted to different effective depths to meet more usage requirements. 4. APPLICABLE OBJECTS: Tungsten carbide wood hole drill bit can be used for opening holes in various solid wood sealing boards, hardwood boards, solid wood products, plastic plywood and other materials. 5. 5 PIECES SET: Tungsten carbide woodworking hinge hole drill bit has 5 hole openers, 15mm, 20mm, 25mm, 30mm, 35mm, you can choose to use according to your needs. Specification: Item Type: Woodworking Hinge Hole Drilling Boring Bit Product Material: Tungsten Carbide Product Weight: Approx. 0.36kg/12.7oz Product Size: Approx. 16x12x4.5cm / 6.3x4.7x1.8in Use: Applicable to various solid wood sealing board, hardwood board, solid wood products, plastic plywood and other materials opening Size: 15mm/0.6in, 20mm/0.8in, 25mm/1.0in, 30mm/1.2in, 35mm/1.4in. Package List: 1 x 15mm Hole Drill Bit1 x 20mm Hole Drill Bit 1 x 25mm Hole Drill Bit1 x 30mm Hole Drill Bit1 x 35mm Hole Drill Bit2 x Hex Wrench Note: All data are measured manually, and there are certain errors in the measurement results.