Dodge Timing Belt Pulley, Dyna-Sync Type KF1, Taper-Lock Bore Type, 1/2 to 2-1/8 in Bore Dia, 4.7 in Outside Dia, 4.456 in, 28 Grooves, 1/2 in Pitch, 1.86 in Face Width, 4.7 in Flange Dia, 0.56 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