Dodge Timing Belt Pulley, Dyna-Sync Type KF1, Taper-Lock Bore Type, 1/2 to 1-1/4 in Bore Dia, 3.11 in Outside Dia, 2.865 in, 18 Grooves, 1/2 in Pitch, 2.34 in Face Width, 3.11 in Flange Dia, 0.44 in Hub Projection, 1215 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