This listing is for an NSF Certified 2-1/2 inch Threaded Stem Caster with a 3/8"-16 x 1" Threaded Stem with a Front Side Brake also known as a Posi Lock Brake combined with a non-marking Polyurethane Wheel. This is great for dollies, furniture, display stands, racks, shelving, carts, food service, and many more applications. These are some of the highest quality 3/8" Stem Casters on the market. We have these fully stocked in our Texas warehouse ready to ship the same day. For more specifications and measurements on this Caster please click on the Technical Specs tab above.