... for carbon steel, bearing steel , stainless steel,non-standard bearing and injection molding roller and dysmorphism parts . ... -life and excellent reliability. 1.Product imformations: Model No Non standard Bearing rollerBearing Material carbon steel ( carbon,chrome, ... friction,5.Less force when closing the door,6.No wear, long life, durability and other ... and window , other furnitures etc. 6.Our factory