Profile: BuyCasters.com is a supplier of casters, wheels and material handling equipments. Rubbermaid® replacement grip ring stem casters & caster wheels are economical and a direct replacement for mop buckets. They are made of zinc plated steel with a thermoplastic rubber wheel. The wheel is non marking and safe on all floors. This set includes casters with wheels and inserts. Our air filled pneumatic casters are for applications that require a cushioned ride. These offer a cushioned, quiet ride, easy to roll and built to handle continuous use. Black tires may leave rubber marks, gray rubber is non marking. Our adjustable height casters offer the ability to level out equipment on uneven floors (slanted floors & around drains) or adjust the working height of equipment to meet the applications needs. Slotted head set screws can be tightened to secure the leg once the caster has been adjusted to the desired height. Caster and adjustable leg assembly are designed not to come apart when over extended.