CLUTCH PINION FOR GGP STIGA CASTELGARDEN ALPINA CHAINSAW WITH PUMP ENGAGEMENT FOR MODELS: PR270, CJ300, CJ305 DIMENSIONS: (A) HOLE: 13 MM (B) OUTSIDE DIAMETER: 57 MM (C) INSIDE DIAMETER: 54 MM INCH PITCH: 3/8 " N TEETH: 6 CODE: 656163 ORIGINAL CODE: 123050007/0 - 23050007 - 6995176 GGP ALPINA STIGA CASTELGARDEN VR