Caster Kit Modular Up To 300lb Supports up to 300 lbs. Caster kit includes four casters (2 front, locking casters, and 2 rear, swivel casters) Provides mobility for organization versatility Front casters lock in place easily Designed for use with select (separately purchased) Gladiator gearbox cabinets, including 28 in. modular GearBox (GAGB28KDYG), 3-drawer modular GearBox (GAGD283DYG) and full-door modular GearBox (GAGB28FDYG)