13 inch /547 x 61 x 54mm,Main Material: Carbon Steel.VEVOR 10 Pairs of 21 Inch Drawer Bottom Side Mount Rails, Heavy Duty Full Ball Bearing Extension Steel Track, Soft-Close Noiseless Guide Glides Cabinet Kitchen Runners with Locking Mechanism, 100 LbsOutstanding Load CapacitySilent Opening and ClosingMultiple Size OptionsEasy InstallationCompact DesignThickened MaterialFits Drawer Length: 21 inch / 533.54 x 2.