Dodge High Torque Belt Sprocket, Type A1F, Series: HT250, Taper-Lock Bore Type, 1/2 to 1-11/16 in Bore Dia, 3.555 in Outside Dia, 3.609 in, 36 Grooves, 8 mm Pitch, 1-1/2 in Face Width, 3.937 in Flange Dia, 1610 Bushing Positive and non-slip driveNo lubrication requiredNon-stretchCorrosion resistantAbrasion resistantVirtually no backlashLong lifeLow maintenance