Aluminum Oxide Flap Wheels Use these versatile wheels for watch bands or for light de-burring and polishing of non-ferrous metals. They replace hand pads and reduce the need for a finishing operation. Great for satin finishing of steel, and ideal for surface contaminant removal. 4" diameter. 1" thickness. 1/4" arbor hole. Available in 4 different grades: extra fine, fine, medium and coarse. Sold individually