Extreme Tools® EX Professional Series PROCASTER6 Upgraded Spring-loaded Casters The design of this set of 6 Upgraded Spring-loaded Casters gives you the extra load capacity and professional look you want for the EX7217RC EX Professional Series 72” 17 Drawer Roller Cabinet. This set of 6 Upgraded Spring-loaded, casters also also features shock-absorbing, self-leveling casters that are load rated 1,200 lbs. per caster. As a result, they can support a fully-loaded, heavy tool box with side cabinets. Moreover, they provide the tough, finishing look that makes your tool box stand out. Features and Benefits of the 6 Industrial Casters set: Load rated 1,200 lbs. per caster Extra capacity industrial-strength casters allow you to fully load your tool box. As a result you can also add on side boxes without a problem Self-leveling casters help to keep your tool box level on uneven surfaces Designed to fit EX Professional Series EX7217RC Roller Cabinets Set of 6 includes 4 locking swivel and 2 rigid casters Caster size: 6” x 2” Overall size: 5”L x 10”D x 9.5”H Extreme Tools EX Professional Upgraded Spring-loaded Casters – Set of 6