Dodge Timing Belt Pulley, Dyna-Sync Type C1, Taper-Lock Bore Type, 7/8 to 3-1/4 in Bore Dia, 11.405 in Outside Dia, 11.459 in, 72 Grooves, 1/2 in Pitch, 1.32 in Face Width, 6-1/4 in Hub Dia, 0.34 in Hub Projection, 3020 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