Features: brand new and high quality Full extension opening allows for the entire drawer to be accessed. Load-bearing capacity: 55.12lbs.Details about size,please check the picture. Please choose the right size before you purchase our drawer slides. Solid ball bearing design provides slient and friction-free motions when open drawer. Such as make a disappearing dog gate, hanging drawer, undermount drawer slides, etc. Ultra smooth soft-close function. Continuous bearings ensure smooth and quiet performance. Package Includes: 1Set Drawer Slide Specifications: Material:Cold Rolled Steel Drawer Slide Sizes(the closed size): Approx.250mm/9.84in,300mm/11.81in,350mm/13.78in,400mm/15.75in,450mm/17.72in,500mm/19.69in,550mm/21.65in Width:Approx. 45.33mm/1.78in Load Capacity: 55.12lbs Color: Black note: Please allow 1-2cm errors due to manual measurement, 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.