Used widely to drill the metal,aluminum alloy,copper,stainless steel and wood. Straight shank design is more suitable for many electric drills (here is not included). Material : High Speed Steel 6542 Surface Treatment : Nitriding Shank Diameter : 1/2" Cutting Edge Diameter : 25mm Cutting Edge Length : 77mm Effective Cutting Edge Length: 60mm Shank Length : 55mm Total Length : 150mm Package Content: 1pcs x Straight Shank Drill Bit