Headlight Bracket for fork crown steel chrome plated very strong: 3 mm (~0,12 inches) thick Hole diameter for lamp: ~  9,4 mm  (~0,37 inches) Oblong hole: 15 x 6 mm (~0,59 x 0,24 inches) With this item you might be able to mount the heavy motobike lamps o the fork crowns 1 piece