Havendro Pack of 5 Office Chair Rubber Wheels Casters in Black; Product descriptions Office Chair Castor Wheels Our office chair castors are floor-friendly. Made from soft, scratch-proof tread made of thermoplastic rubber (TPR), theyre excellent floor protectors suitable for all hard and soft flooring! Universal Size - The stem size of our office chair wheels are 7/16" x 7/8" (11mm 22mm) in diameter which fit most of the office chairs on the market (Not 1KEA)! Premium Office Castors Our premium office wheels prevent scratches, dents and any other floor damage. They are also abrasion-resistant which can roll across the floor quietly even after intensive use. Easy Installation No tools required. Just pull the old casters out from the chair legs and install by pushing our office chair casters stems into the leg socks. Chair castors can support loads up 650 pounds (295kg)! Important The stems are 7/16" x 7/8" (11mm 22mm) in diameter which is NOT Compatible with 1KEA chairs. Thoroughly measure the section of the stem that attaches to the furniture leg using callipers! Package list: 5 2 " Caster 1 Wrench Havendro Pack of 5 Office Chair Rubber Wheels Casters in Black color: Black