Full drawer extension on genuine progressive telescoping ball-bearing slides provide smooth, trouble-free operation. Built-in drawer interlock system prevents more than one drawer from opening at a time, reducing the chance of cabinet tip over. Single lock system secures all drawers with one key (two keys included). Adjustable leg levelers keep cabinets level in any type of surface Extra deep drawers accommodates hanging rails for letter or legal size files. Rolled or hemmed edge drawer sides for strength, rigidity & safety. Cross Bar Kits (not included) available for front-to-back filing. Powder coat finish. Plastic handle.