Sprocket Clutch High performance, OD: 4 3/16 ", Keyway: Grooved; built-in 3/16", Teeth: 12, Thermodynamic design absorbs heat without damaging springs, Includes retaining ring and set screw, Maximum 13 HP rating, Bore: 3/4 ", Height: 2 9/32 ", Chain Number: 35. Fits Models: Replaces Part Numbers: Hilliard LD4-S-5L Stens Part Number: 255-224