Biteharder Carbide Runner Sharpening Tool - Standard Series (CRST150-60-STD) Our standard series tools are designed to be used with a portable drill for anywhere sharpening convenience (trailside, trailer or garage) With proper use our industrial diamond cutting media allows you to maintain your carbide runners edge over their entire useful life Sharp edges provide improved control, handling and performance in all conditions Better control of your snowmobile results in a much safer ride Experience all of the performance your snowmobile has to offer all season long