Dodge Timing Belt Pulley, Dyna-Sync, Taper-Lock Bore Type, 1/2 to 1-1/8 in Bore Dia, 2.87 in Outside Dia, 2.507 in, 21 Grooves, 3/8 in Pitch, 3/4 in Face Width, 2.87 in Flange Dia, 2 in Hub Dia, 0.13 in Hub Projection, 1108 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