Roller Blade Chair Caster Wheels for Hard Floors with 7/16" X 7/8" (11mm X 22mm) Grip Ring Stem - Complete 5 Piece Set - Stylish Replacement Casters with Clear Rubber Treads - Easy Installation Roller blade chair caster wheels offer excellent performance, design, and versatility. 3" clear soft treads offer a smooth ride and protect floor surfaces. Please view the pictures for better detail of dimensions and style. Ball bearing axels and pivots. Sold in complete sets of 5 pieces. Please double check your stem measurements before ordering. See full product description below.