Mr.Garden Set of 10 Garage Door Roller With 13 Ball Bearing 2-Inch Stem Nylon & Steel Hardware Door Rollers, Black

1.The Rollers have a lubrication groove to disperse lubrication over a long period of time.
2.They allow the door to operate smoother, quieter, giving less stress on the opener and less stress on the door hinges.
3.These rollers alone will make a huge difference ,they dramatically reduce vibrations and noise caused by metal rollers.
4.The rollers can bear duty up to 25 kilograms, and meanwhile, it can work smoothly in the environment of the 45 degrees below zero.
5. Adopt mechanical bearing, with a longer working time than general rollers .