These fender washers are great for mounting fiberglass fenders, aluminum panels, etc. as it spreads the load over a greater surface area. They are CNC machined in-house from 6061-T6 aluminum and are available natural or anodized black, gold, red or King blue. They are designed to be used with a 1/4" flat head screw with a 82 degree taper under the head. Our 10 pack includes the stainless 1/4-20 x 1" flat-head phillips drive screws, 1/4-20 clip-on nut plates and 0.100" thick steel tabs for mounting. The clip-on nut plates make tightening easier so you don't have to get a wrench on the backside and if you ever strip them out they are easily replaced. In the past we suppled nyloc nuts and weld-on nuts. We’ve been supplying these to the offroad industry for 20+ years. These aren’t cheap imports or copies like you’ll see online.