ACDelco MP2241 Professional Belt Tensioner Installation Tool Used for tensioning all automotive V-belts up to, and including, 7?8 in top widths for versatility Scale reads in pounds and kilograms and measures tension from 30 to 160 lbs., and 15 to 75 kg for ease of use Die-cast aluminum body, nylon indicator arm, and pressure pad for enhanced durability Fits in a pocket like a pen and has a stainless steel pocket clip for customer ease Individually boxed for customer convenience