... rail assembly for precision shafting. End Stop Collar ESC-Series Bore Sizes: 1/2" through End Stop shaft Collars Fits over rail ... assembly for precision shafting.End Stop CollarESC-SeriesBore Sizes: 1/2" throughYueqing Bethel Shaft Collar ... , Stainless Steel Shaft Collars, S-style Split Collars, XTH, XTB, QD, BM Style Split Taper Bushings, Ductile iron shaft collars and ...