PS-5701Heavy Duty Drawer Slides 57mm Heavy Duty Ball Bearing Drawer Slides 1:size:12"-32" 2:Material: Work hardened cold rolled steel 3:Mounting: Side, for frame and frameless construction 4:Load capacity: 115kg/450mm(18") 5:Finish: Electro-zinc plated ; Color chromate ; Black Chrome 6:Thickness: 2.0/2.0/2.0mm 7:The installation gap: the installation gap between rail is 19+/-0.1mm 8:Option: 1" over travel