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Length: 14 mm / 0.55 inches, Thickness: 4 mm / 0.16 inches, Height: 4 mm / 0.16 inches. This is a woodruff key for 110cc 120cc 125cc 140cc pit bike engines. Woodruff keys prevent parts from spinning freely on the crankshafts on which they are located. They are often found on axles and crankshafts, where they slot into the key ways found on flywheels etc. Woodruff key is made of metal, rust-proof, wear-resistant, and high expanding ability.