"Product Description Material: Galvanized Iron color: silver Material ball size: nylon Ball diameter: 16mm (0.5 inch), 25mm (1 inch) 16mm Dimensions: 48 x 32 x 20mm (L*W*H) 25mm Dimensions: 75 x 50 x 30mm (L*W*H) Package includes: 4 x Roller Transfer 8 screws 1. nylon furniture, 1 x screwdriver, 8 x screws, 16/25mm diameter round ball transfer, the space to install the transfer bearing roller is small.There are two holes mounting for screw mounting. 2. 【HIGH-QUALITY MATERIALS】: The main body of the furniture ball transfer unit is made of galvanized carbon steel, which has the properties of scratch resistance, corrosion resistance, rust resistance and does not is not easy to damage. 3. 【COMFORTABLE AND CONVENIENT】: smart and hassle-free; The ball can rotate 360 degrees flexibly, use it smoothly, move the goods faster and save more time. The maximum load capacity of a single caster is 15 kg, which is applied to most objects. 4 . 【NO NOISE】: The ball bearing transfer units are polished