AB 847H-JK2C-RG00500 INCREMENTAL ENCODER , 65 MM DIAMETER SERVO MOUNT (42 MM B.C.) , 6 MM DIAMETER SHAFT WITH FLAT , 8-30 VOLT LINE DRIVER,HTL (B-LEADS-A, CW, Z GATED WITH BN) , MS CONNECTOR, 10-PIN WITH MATING CONNECTOR, 500 PULSES PER REVOLUTION.