Full Extension:2 folds structure drawer slides help to open or close the keyboard drawer completely,to maximize the use of space and reach the most inside stuff 17mm/0.67inch width Thickness 0.8mm 20kg Type:2pcs 182mm/8inch,214mm/9inch,246mm/10inch,278mm/11inch,310mm/13inch,342mm/14inch,374mm/15inch,406mm/16inch,438mm/17inch,450mm/18inch Side mounting Super Smooth &Quiet:Built in double row solid steel ball,smooth and accurate sliding,move quietly and stable.Rubber brake design reduces damage caused by drawer switch collision,silencers shock absorption,increase service life. Material technology：finish cold rolled steel prevents it from,and wear-resistant These drawer runners are suitable for various home drawers and office furniture. They can be applied to wardrobe drawers, keyboard drawers, cabinet drawers, wooden or steel drawers, and toolbox drawers that require large load-bearing capacity.