TRB RC M15x21mm Dia. Steel Shim Pack 10ea 0.1, 0.2, 0.3, 0.5mm Width / Thickness. Dimensions and Qty's: ID = 15mm OD = 21mm Width/Thickness = 10ea 0.1mm 10ea 0.2mm 10ea 0.3mm 10ea 0.5mm