OEMTOOLS 27261 Alternator Decoupler Pulley Tool Kit Set Works on Both Overriding Alternator Decoupler (OAD) and One-Way Clutch (OWC) Pulleys Tools May Be Used While the Alternator is On or Off the Vehicle Set Includes Two Pulley Sockets: H22 x 33T and H17 x H19 x 30L and Three Shaft Bits: H10 x FM H10, T50 x H10 x 75L and M10 x H10 x 75L