ITEM NAME:Soft PU Casters Wheels For Office Chair Hardwood Heavy Duty Replacement Set FT Specification: 1.Material:Plastic,Metal Connector; Size:1.1x2.3cm / 0.43 inchx0.9 inch(DxL) 2.Wheel Diameter:5cm/1.96inch 3.Standard Stem Length:7/8 inches / 22mmStandard Stem Diameter:7/16 inches / 11mm Cup size: 25MM 4.360 Degree Swivel Rotation,fits all office chair bases with 7/16 inch (industry standard) mounting holes. 5.Meet or exceed ANSI/BIFMA safety standardï ¼Å’cycled 2,000 cycles over the obstacles; and then 98,000 cycles on a smooth〠hard surface without obstacles. 6.Caster Capacity: 110 Lbs. Each 7.Net weight: 100g Package Include: 5 x Caster Wheel.Caster Capacity: 110 Lbs.