... Housing;Bearing Wheel;Radial Bearing with Shaft; ITEMN0.DIMENSION(mm) D1 D2 d H B T PCB 3134 57.15 54.10 ... of plastic materials (POM, PP, PA, nylon), with excellent surface for sliding windows and doors 2) Inner ring is made of ... (POM, PP, PA, nylon) or metal material, with excellent surface for sliding windows and doors3) The inner ring is made of ...