... bearings for carbon steel, bearing steel , stainless steel,non-standard bearing and injection molding roller and dysmorphism parts . Our ... life and excellent reliability. 1.Product imformations: Model No Non standard Bearing rollerBearing Material carbon steel ( carbon,chrome,stainless steel, ... ,RS,OPEN (metal or nylon) It can option)Size 4*18.5*7mmColour blackPacking details1.tube->paper box->craft ...