Greenco Super Strong Bed and Furniture Riser, Great for Under Bed Storage - Pack of 4 Instantly add an additional height of 5.25 inches Made of heavy-duty unbreakable plastic; can carry even the heaviest furniture in your home. Great for creating more storage space underneath your bed. May be conveniently used on virtually any type of bed; features a 1-inch raised edge to keep bedpost or caster securely in place. Bed risers may be stacked together when not in use to conserve space. Made in the USA. Works with a maximum bedpost diameter of 2.5 inches Instantly add an additional height of 5.25 inches. Made of heavy-duty unbreakable plastic; can carry even the heaviest furniture in your home. Great for creating more storage space underneath your bed. May be conveniently used on virtually any type of bed; features a 1-inch raised edge to keep bedpost or caster securely in place. Bed risers may be stacked together when not in use to conserve space. Made in the USA. Works with a maximum bedpost diameter of 3 inches