Gladiator GACK04KDSX Ready-to-Assemble Modular GearBox Caster KitHighlights: The swiveling rear casters make the unit easy to move Supports up to 300 lbs. Add casters to the steel modular Gearbox for mobile storage in the garage Stainless steel color Caster kit includes four casters (2 front, locking casters, and 2 rear, swivel casters) Designed for use with select (separately purchased) Gladiator gearbox cabinets, including 28" modular GearBox, GAGB28KDYG (Catalog ID: 42964994), 3 drawer modular GearBox;