Guide for Choosing Size of Drawer Slides: 1. Pull-out stroke: ±3mm, thickness ±0.2mm. 2.Please check the size in detail before purchasing, if you encounter any problems, please contact us in time! Product nameblack steel silent three-section slide ModelB4512 MaterialCold rolled steel Size specifications10 inch-20 inch(250mm,300mm,350mm,400mm,450mm,500mm) Installation methodSide installation Bearing capacity45KG Material thickness1.2MM Scope of usecomputer desks, desks, household drawers, packing list: Drawer Rail*2pcs Note: Due to manual measurement, there may be an error of 1-3mm, please understand! The product may have slight chromatic aberration due to the shooting light, angle, and different displays. Please understand! High quality: slide opening and closing test 100,000 times. which is durable and the normal service life of the slide rail exceeds 30 years.The drawer runners are made of high-strength cold-rolled steel with upgraded quality. Good bearing capacity: Made of 1.2mm high-density thickened steel, better bearing capacity. The bearing capacity can be as high as 45kg/100 Pound. It can meet the needs of various household drawers.There are other sizes available Drawer Slides250mm,300mm,350mm,400mm,450mm,500mm(10 - 20 inch)Optional,width45mm Excellent anti-rust performance & Smooth and silent:surface electrophoresis treatment. The electrophoretic layer prevents air from directly contacting the rail steel plate, thereby resisting oxidation and improving corrosion resistance. Full Extension drawer Runner:3-Fold Full Extension, opening allows for the entire drawer to be accessed. make full use of drawer space.Solid ball bearing design.provides slient and friction-free motions when open drawer., nstallation requirements:The thickness of the slide rail is 12.7mm. It is recommended to reserve 13mm for the unilateral installation gap. If you are not sure, please contact us and we will solve it for you.