Features: Silent nylon pulley Longer hydraulic buffer design Barb tail design Specification Product name: Hidden drawer slide Product material: cold rolled steel material Surface treatment: galvanizing process Installation method: Bottom installation Function: Push to Open Product size: 250mm/10inch , 300mm/12inch , 350mm/14inch , 400mm/16inch , 450mm/18inch , 500mm/20inch , 550mm/22inch , 600mm/24inch Package list: Drawer Ball Bearing Runners Slides *2pcs(1pair) screws*1 set 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! Material: The guide rail is made of high-quality cold-rolled steel, the surface is smooth, corrosion-resistant, rust-proof, beautiful and durable Precision steel ball bearing, low opening and closing noise, stable operation Barb tail design: Drill holes in the corresponding positions of the barbs on the backplane, and hang the barbs in the holes to prevent the drawer from sliding inward and extend its service life Three-stage design: Our slide rails have three sections, which can be all pulled out when installed on the drawer, making the most of your storage space and making it easier to retrieve Hidden slide rail, beautiful: this drawer slide rail is installed at the bottom, which perfectly hides the slide rail and makes your drawer more beautiful Push to Open Drawer slide rail includes a pair (2 pieces), 250mm/10in, 300mm /12in, 350mm/14in , 400mm/16in, 450mm/18in , 500mm/20in, bottom mounting, each group can bear a weight of 50kg