Uxcell 21mm Diameter Bit Woodworking Hinge Tip Boring Drill Tool Product Name: Hinge Boring Bit; Material: Metal Color: Silver Tone and Gray Shank Diameter: 8mm / 0. 3"; Total Length: 73 mm/2. 9 " Borer Drill Diameter (Approx.): 21mm / 0. 8" Weight: 38g; Package Content: 1 x Hinge Boring Bit