Metal plates too thin as when tightening the very thin plates starts to dip. Also the backing plastic plate does hold much grip when fixing on the metals part of the pedals as it tends to slip. Perhaps a rubber backing on top of the plastic would help and it would have better grip along the fixings. For the price, i think it’s a not so great piece of equipment considering the quality (poor). This is the orice you pay for shopping online where you dont have the tangibility factor buying on a whim