Re-sharpens blunt or broken drill bits from 2mm to 12.5mm.Automatic depth setter to avoid over grinding.Included in the kit are two grinding wheels a white aluminum oxide wheel for steel (HSS) drill bits and a green, silicon carbide wheel for masonry bits.The drill sharpener comes in its own fitted portable carrying case and is powered by the users own electric drill.No specialist user skills required.Variable Angle. 80 to 135 Easy to use Save time and money Regrinds steel, carbon steel, and carbide tipped drills Regrind bits to original specifications Exact results every time Powered by any standard power drill Full one-year warranty Made in England