Specifications:Using high-quality steel, it is durable.Adopting shock absorption technology, the spring design has better shock absorption effect, the steel balls achieve silent effect.It is suitable for drawer, computer desk tray, cabinet, cupboard, etc.Item Name: Slide RailMaterial: SteelQuantity: 2PcsFeatures: Easy to Install, Durable, MuteSize:01 (12 inch): 30cm x 4.5cm x 1.3cm/11.81" x 1.77" x 0.51" (Approx.)02 (14 inch): 35cm x 4.5cm x 1.3cm/13.78" x 1.77" x 0.51" (Approx.)03 (16 inch): 40cm x 4.5cm x 1.3cm/15.75" x 1.77" x 0.51" (Approx.)04 (18 inch): 45cm x 4.5cm x 1.3cm/17.72" x 1.77" x 0.51" (Approx.)05 (20 inch): 50cm x 4.5cm x 1.3cm/19.69" x 1.77" x 0.51" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:2 x Slide Rail