Product Name : Hinge Boring BIt;Suitable for : Wood CuttingDrilling Diameter : 70mm / 2.75;Shank Size(Small) : 24 x 9.5mm/0.94 x 0.37(L*D)Shank Size(Big) : 34 x 15.5mm/1.3 x 0.6(L*D);Total Length : 80mm / 3.1Material : Metal, Carbide;Color : Gray, BlueWeight : 171g;It can enlarge existing holes with ease and can bore any arc of a circle.Carbide tip is specially designed to pass through hole cleanly in end grain and thin stock, great for boring concealed hinges and door clocks.Should work with an electric drilling tool, which is not included here.Package Content : 1 x Hinge Boring BitNote:Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.