●(If you do not know how to choose the right size and style, please contact us to help you buy) ●Anti rust and ant corrosion:drawer slides are treated with electroplated blue zinc plating,The electroplated layer can prevent direct contact between the air and the track steel plate, thereby resisting oxidation and corrosion ●Soft-Close: featuring soft-close functionality to ensure the drawer close softly and silently. ●High quality, long service life:Made of thick steel plate, high density, high strength, load-bearing capacity up to 35kg/80 lb,slide opening and closing test 100,000+ times. which is durable and the normal service life of the slide rail exceeds 30 years ●Long warranty:The warranty period of the slide rail is 1 year. You can contact us at any time to solve different quality problems or usage problems . Rear mounting bracket not supported ●Hidden bottom installation:Make your drawer making it cleaner and more beautiful,the slides hide away with ease,Mounting screws included.