★ 6 pairs of 18 inch,mounting screws included (extra screws offered for spare use). Attention: the mounting brackets are not included,please buy separately if need it. ★ Side mounted Steel ball-bearing action creats silent working.18'' in length.1.77'' in width.0.5'' in thickness. ★ Zinc Plated and made of solid cold rolled steel.Rust resistant for your lifetime use. ★ Black buckle on the third channel makes easy removal for installation.Nylon rubber produces less noise at closing and opening,creating a silent life environment for your family. ★ Guide for Choosing Size of Drawer Slides:To determine which size of slides are good for your drawer, please measure the length of the drawer without the frame board. And if the length is not even, please choose 1 inch shorter. The length of slides can't be longer than the cabinet case depth.And face frame cabinets will require a rear mounting bracket, whereas for faceless cabinets the slides are mounted directly on the side., Manufacturer: Tobinice