1,sleeve assembly: match three common shaft sizes:12mm, 16mm,20mm, 5/8'' ... finished products, mould designing,lathing,stamping,molding,grinding and final assembly are all accomplished in ourselves specialized facility. We exactly follow ... : match common shaft sizes: 12mm, 13mm, 15mm, 16mm ,17mm, 20mm, 1/2'', 5/8'', 3/4''3, sturdy coil spring4, sintered ...