Usage Tips:Description Manufactured with stainless steel material, the chair saver kit durable for long-lasting use. The chair saver kit comes with a wrench, allow to install easily, easy to install, suitable for most office chairs or gaming chairs with a cylindrical. Features -Color:Black -Material:Stainless steel -Size:4.50X1.50X1.50cm/1.77X0.59X0.59in -Size:7.30X2.00X0.50cm/2.87X0.79X0.20in -Size:2.50X2.50X1.40cm/0.98X0.98X0.55in -Internal diameter: 25mm -External diameter: 45mm - Chair saver is easy to install, come with wrench for simple installation, no professional skills required. - Use this chair saver to fix sinking chair, prevents damage caused by sinking chairs, extends lifespan. - The chair saver is suitable for various office chairs and gaming chair, with high compatibility. - Cylinder fixing ring, stable and reliable, made of stainless steel, practical and strong to use. - Chair saver, stop sinking without replacing the gas lift cylinder, time-saving and effortless. Package list: 1 x Chair Saver 1 x Wrench