Dodge Timing Belt Pulley, Dyna-Sync, Taper-Lock Bore Type, 1/2 to 1-1/4 in Bore Dia, 3.34 in Outside Dia, 3.104 in, 26 Grooves, 3/8 in Pitch, 1 in Face Width, 3.34 in Flange Dia, 1.81 in Hub Dia, 0.44 in Hub Projection, 1210 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