Features:Rolling smooth:Over the course of repetitive use,the-original wheel on some aged,heavy wood closet door might wear out and stuck.These wheel will keeping certain space from the mounting-bracket and therefore fit nicely into the sliding-groove.Now-you-can replacement the-rollers with these,they will slide like silk - almost no effort for them to move.The improvement is really unbelievable.Easy to control:With a build-in ball-bearing so-easy to use,it is so quiet almost feel like ice skating.You can control the drawer going exactly the direction you want it to-go.They-are made of-ABS,the plastic-roller surfaces is not too-hard or too soft,providing excellent support. Combining hubs made of solid-bearing steel,they will hold the weight of the door with ease.You can use these for repairing old kitchen drawer-slide-rollers or to replade-rollers in patios stove drawer.You have multiple-choice to apply them. Specifications:Material:ABSSize: 19: Approx.18.5mm/7.28"20: Approx.20mm/7.87"25: Approx.25mm/9.84"27: Approx.27mm/10.62" Note:Please allow 1-2cm errors due to manual measurement,Please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:8Piece/set Bearing-Rollers