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Description Description: Tooth count: 10 Bore diameter: 5/8" Outside diameter: 1-3/4" Hub width: 5/8" Milled keyway slot: 7/32" This 10 tooth chain sprocket is used with size #40, #41, and 420 chain found on 20 & 30 Series torque converters. It uses the common 5/8" bore (inside) diameter that matches up to the 5/8" axle shafts on many popular models. This is a Type C sprocket where the 5/8" thick hub is centered equally on both sides. (Type B sprockets have the hub offset to one side.) In addition, this sprocket is milled for a 7/32" shaft key.