When building cars we always struggle to find decent hardware that will provide a safe reinforcement for mounting seats, harness eyebolts, and ballast. Most hardware store washers aren't very thick and will bell or pull through the thin floor on most modern cars. With that in mind, we designed these square 2" washers that are perfect for most harness eye bolts and M10 or 3/8" bolts. They come unfinished so you can tack or weld them to the floor as well.