◎Holds pulley firmly without free rotation by inserting the bolts into the holes on pulley ◎Jaw is adjustable and a big blue handle,strengthening its holding ability ◎Suitable for universal engines ◎Applicable to work on camshaft pulley,crankshaft pulley, fan pulley and idle pulley ◎Set includes 4 pairs of adapters ◎Jaw spread:25-100mm ; Adapter sizes:7,10,14,16mm