The SPACEKEEPER Retractable Caster Kit is made of metal and comes in a variety of colors.It features lockable casters, ribbed lift pedals for extra grip, and a quick release system that allows for easy mobility of workbenches, cabinets, and machinery with flat bases.These casters are designed to support heavy capacities and will help you get your jobs done more efficiently while staying in place when needed. Features 1.The casters are designed to lock upon proper handling so that all heavy capacities stay in place. 2.An individual need only push their foot down on the pedal to lock a desk from rolling away on the jobs. 3.The wheels of each caster carry workbenches effortlessly, so you can spend more time getting your jobs done. 4.The retractable casters are equipped with quick release plates, work by simply pushing down on the pedals to raise your workbench off the floor. 5.Each lift pedal of the heavy duty retractable caster is ribbed and textured to provide extra grip when foot pressure is applied.The casters will work on workbenches, stands, tables, cabinets and lightweight machinery with flat bases. Specification Material: Metal Color: See Photo Package Includes: 1 x Retractable Caster Set