R58 drill bits have a reduced 3/4 inch parallel shank on all diameters so you can use large diameter drills in hand held power tools. They have a conventional 118 degree point angle, providing a strong point which is easy to re-grind. Manufactured from High Speed Steel, the tools can be used to drill a wide range of materials including steel, aluminum and stainless steel, whilst the steam oxide finish prevents workpiece material from sticking to the cutting edges of the tool for cleaner, more accurate holes. R58 reduced shank drills are available in 25 different large diameters from 1 inch up to 2 inches and are suitable for many different hand held and machine applications.