Material: Made of solid metal material, it can withstand harsh weather conditions and intensive use Installation: The sliding door rollers are manufactured to previous specifications, and damaged parts can be directly replaced, saving a lot of time Features: The rollers in the sliding door eliminate the hidden dangers of stability of your door. Equipped with smooth and tight rollers means you will get a fairly reliable door roller System initialization after installation: After replacing the electric sliding door roller, some models may need to manually fully open and then fully close the door to allow the computer to relearn the door's stroke and resistance coefficient. Check the for bracket screws regularly: Sliding doors receive greater impact at the moment of closing. It is recommended to check the fixing bolts of the roller for bracket for every six months to ensure that they are in standard torque to prevent the door from sagging or making abnormal noises caused by loose screws., Manufacturer: zhaxide