Uxcell Carpentry 21mm Diameter Forstner Tip Hinge Boring Bit Drilling Tool Product Name : Hinge Boring BIt; Suitable for : Wood Cutting Drilling Diameter : 21mm / 0. 83"; Shank Diameter : 8mm / 0. 31" Total Length : 83mm / 3. 3"; Material : Metal, Carbide Color : Yellow, Silver Tone; Weight : 62g Package Content : 1 x Hinge Boring Bit