Lisle's alternator decoupler pulley tool kit, No. 57650, removes and installs many alternator decoupler pulleys found on the most popular vehicles in North America. Consider replacing alternator pulleys whenever selling a belt. The kit works on both OAD (Overrunning Alternator Decoupler) and OWC (One-Way Clutch) pulleys. Kit includes: 33T spline pulley socket, 17mm hex pulley socket, 10mm triple square shaft bit, T-50 shaft bit and 10mm female hex shaft bit. Works with the wrenches and sockets technicians already own.