4 Neo Chrome Billet Aluminum Washer For Motorcycle License Plate Frame Holder 8H These will fit any 10mm bolt on your vehicle. Designed Especially for Motorcycle/Bikes/ATVs/Tractors. Bolts are 6mm x 20mm, longer than many others out there. This is for a set of 4 license plate bolts with washers and nuts. These washers will fit nearly every late model vehicles's license plates.