Universal - designed for 15mm diameter axle 'U' shape Heavy metal Axle hole is 15mm - fits older japanese trail and mx bikes Second washer spot welded to one side for extra strength Over all length, not including adjustor bolt is 65mm Adjustor bolt and lock nut is M12 - 12mm Adjustor bolt has tapered end Over all bolt length is 65mm Over all diameter at axle hole is 35mm Metal thickness is 2mm Spacing between each arm of the 'u' is 7mm?