Whatever your office furniture caster needs, we have the caster to fit your application. If you do not see it here please call or e-mail us and our customer service team will help you find the right caster for your application. All of our twin-wheel furniture casters are compliant with BIFMA standards and pass all of the required BIFMA tests. Our casters constantly undergo rigorous testing to make sure they are of the highest quality available on the market. 50mm Caster with 5/16" x 1" Threaded Stem.