Features:High high quality workplace chair rubber caster wheel.Heavy Duty & Safe match all workplace chair bases with mounting holes.Twin wheel design complements weight distribution and delicate operation, ease to glide and swivel.Swivel and roll freely and extra quietly in every path with no need for maintenance.Soft roll rubber wheel floor guaranteed to leave no mark on carpets or any style of pure and engineered wooden floor, tile floor, strong point floor, and delicate concrete/asphalt floor.Easy match - Just click in.Specifications:Material: Steel and RubberWheel diameter: As shownStem Length: As shownStem Diameter: Approx 10mm and 11mm (As shown)Color: Black With TransparentPackage List:5 x Chair WheelsNote:1.We provide clean pictures, measurements where possible. Please check as much as possible to make sure the item is the one that you need.2. Please enable 0.5-1 inch distinction thanks to guide measurement.(1 inch=2.54cm)3. Due to the adaptation between varied monitors, the picture may not mirror the particular shade of the item. Please understand,Thank you.