Features:These casters are designed with the universal standard size stem, so you can transform any task chairs or stools that roll into modern, striking furniture. Each caster is constructed of high quality PU which withstand a load up to 50kg.The caster is very smooth, easy to move and roll.A good replacement for your chair or other furniture which can make your life easier.Convenient to use, wheels can easily be installed without tools or hardware. Specification:Material: PUWeight: Approx.535g-1360g or 18.9oz-48ozDiameter: Approx.75mm or 3inMounting Height: Approx. 90mm or 3.54inchLoad Capacity: Approx.50KgQuantity: 5Pcs Type: 1,electrocoating with circlip or 2,electrocoating with screw rod or 3,galvanizing with circlip or 4,PU single wheel (Optional)Size:( 1, 3) Approx. 11 x 22mm or 0.43 x 0.87inch ( 2) Approx. 8 x 17mm or 0.31 x 0.67inchPackage List:5 x CastersNote:1. Please allow slight measuring deviation due to manual measurement..2. Please confirm that your requirements are consistent with our product size description before ordering.