This is a 3 inch diameter sanding sleeve used on oscillating spindles sanders used for sanding curved edges. Can be used on Triton TCH450SPS, Delta SA350K, King KC700C, Craftex B2322, General 15-220. Available in 80 and 120 grits. To get best results, take flowing , long , light passes of your work , moving side to side along the edge in a skimming motion, finally pulling away at the end of your pass.