License Plate Frame Screws Fasteners M6x20 + Screw Caps Set N License Plate Frame Screws Fasteners + Chrome Screw Caps Set 28pcs. Brand new Top quality These screws are made of high quality metal for license plates and frames. M6x20 Standard size, will fit most American and Import cars. The white Square nuts is designed to plug into the hole on bumper to fix the screw.