Modelcraft radial stainless steel ball bearings modelcraft s 692 zz w2 3 modelcrafts radial steel ball bearing 6mm od 2mm bore 23mm width has been manufactured to a high standard using stainless steel to ensure a long life to be installed in a clean room modelcraft s 692 zz w2 3 radial steel ball bearing 6mm od 2mm bore 23mm width