【Installation requirements】Suitable for drawers with an internal depth of ≥ 305-350mm.— Drawer rrunners length: 300mm（12inch).— Fully extended length:570mm（22 inch). — installation clearance: 12.5mm(Each). Comes with mounting screws.It can meet the needs of various household drawers.There are other sizes available soft close drawer runners slides 300 350 400 450 500 550 600 mm Optional.If you have any questions or problems, please feel free to contact us. 【30 Year Service Life】 These soft close Drawer Runners adopt double springs and a pure copper buffer, ensuring quiet operation with no noise. They enable the drawer to close automatically and slowly in the final segment of its travel, providing safety and preventing fingers from being pinched. The number of opening and closing cycles of these Soft Close Drawer Runners is as high as 100,000 times. 【Better Pure Copper Buffer】These soft close drawer slide rails adopt a new copper hydraulic buffer double-spring structure, which operates at as low as 30 decibels for silent, noiseless use. Since the inside of the slide rails are pulled inward, extra force is needed to open them—therefore, a handle is required for the drawer. If your drawer does not have a handle, choose our push to open drawer runners instead. 【Detachable & full extension 】 There is a black plastic buckle on the back of the slide rail, and the drawer can be easily taken out by pressing it，Easy to install. 3-Fold full extension drawer runners, The drawer runners rail is fully extended, so that the drawer can be fully drawn out, which is convenient for storing items. 【Good bearing capacity & Excellent anti-rust 】These Drawer Runners are Made of 1.2mm high-density thickened steel, better bearing capacity. The bearing capacity can be as high as 45 kg. surface electrophoresis treatment. The electrophoretic layer prevents air from directly contacting the rail steel plate, thereby resisting oxidation and improving corrosion resistance., Manufacturer: Foshan yenuo Hardware Co., Ltd