OTC's Variable Pin Scanner Wrench features a universal design that fits many different types of pulleys having slots or holes, including camshaft pulleys, crankshaft pulleys, and more Wrench is adjustable from 1-1/4 inches to 5 inches by loosening single adjustment bolt Use wrench as-is with it's approximate 12 inch overall length, or for more leverage, use with a 1/2 inch drive ratchet or breaker bar Set includes the following pairs of high-strength steel pin sizes: 3.5 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, 7 mm, 10 mm plus a heavy-duty steel handle assembly Rugged blow-molded storage case keeps set components contained and organized so they are ready to use when you need them