28 ounce flywheel counterweight used on externally balanced flywheels on the following vehicles: '68-'80 302/5.0L, '69-'97 351W, '77-'82 351M & 400M, '70-'74 351C, '66-'70 428, '79-'99 460. Came with a flywheel I ordered for my early 460 which doesn't use counterweight. Bag it came in is incorrectly marked for a Chevy application. McLeod's weight kits for Fords normally come with a 50 oz. and a 28 oz. weight. Correct part # is 563333. Instructions and screws included. Has some surface rust.