Dodge Timing Belt Pulley, Dyna-Sync Type KF1, Taper-Lock Bore Type, 1/2 to 2-11/16 in Bore Dia, 6.58 in Outside Dia, 6.366 in, 40 Grooves, 1/2 in Pitch, 1.86 in Face Width, 6.58 in Flange Dia, 0.11 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