3 Posts provide 2 side-by-side racks. These posts are 16 cold rolled steel with a tie beam at the top of the system for extra support. These mount to a 1.25in or 1.75in worksurface. This three post system provides half length accessory options and are easy and convenient to adjust from shift-to-shift as needed. Options can be aligned or independently adjusted for maximum flexibility. This is a double slot system that allows all options to adjust in 1in increments.