Dodge Timing Belt Pulley, Dyna-Sync Type C1, Taper-Lock Bore Type, 1/2 to 2-11/16 in Bore Dia, 9.997 in Outside Dia, 10.027 in, 84 Grooves, 3/8 in Pitch, 1-1/4 in Face Width, 4.88 in Hub Dia, 0.55 in Hub Projection, 2517 Bushing Synchronized and no-slip transmissionNo lubrication requiredApproximately 98% efficiency can obtainedLow maintenanceVirtually no backlashConstant linear velocity8.5:1 drive ratioEasy On/Off operationFlange design standard on drive size