289-708, RS PRO, Copper Crinkle Locking & Anti-Vibration Washer, M8, BS 4463, Brand RS Pro, For Screw/Bolt Size M8, Washer Type Crinkle, Inside Diameter 8.48mm, Outside Diameter 14.87mm Copper Crinkle Locking & Anti-Vibration Washer, M8, BS 4463