OEMTOOLS 27261 Alternator Decoupler Pulley Tool Kit, 5 Piece, Pulley Sockets and Shaft Bits Fit Most OAD and OWC Pulleys, Alternator Pulley Kit and Repair Tool. Easy To Use: The tools in this alternator decoupler puller set may be used whether the alternator is on or off the vehicle; Alternator decoupler pulley puller kit works on overriding alternator decoupler pulley (OAD) and one-way clutch pulley (OWC).