Dodge Timing Belt Pulley, Dyna-Sync Type C2, Taper-Lock Bore Type, 1/2 to 2-1/8 in Bore Dia, 8.564 in Outside Dia, 8.594 in, 72 Grooves, 3/8 in Pitch, 3/4 in Face Width, 4.38 in Hub Dia, 1/4 in Hub Projection, 2012 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