Model: LM16UUOP (Nominal Shaft Diamter (dr): 16mm, Outer Diameter (D): 28mm, Total Length (L): 37mm) Open Type Linear Motion Ball Bearing Bushing Sealed on Both Side Chromium Steel shell and bearing ball, good abrasion resistance, high precision and good strength Smooth moving, low friction, high rigidity and long working life Suitalbe for kinds of electronic equipment/guide bar, and pillar