Yescom 5pcs 2" Diameter Office Chair Caster Wheels Rubber PU Modern Design Ideal for Hardwood Floors Tile Vinyl 5pcs Rubber Caster Wheel, fits most office chairs Designed to protect hardwood floors, tile, vinyl, etc Outer wheel material - rubber/ polyurethane Wheel Diameter: 2" (50mm) Stem Diameter: 7/16" Grip Ring Type (11mm), Stem Height: 0.86" (22mm)