The sinking fix kit for office chair, craftsmanship and stainless steel and rubber material make it look simple yet . The office chair repair tool is suitable for a variety of chairs, you can apply them , school, office, restaurant, cafe, and other places, helping to fix the office chairs, which can bring you huge convenience. Features -Color:Silver -Material:Stainless Steel, Rubber -Size:8.70X3.20X0.70cm/3.42X1.26X0.28in(Wrench) -Size:6.50X3.20X2.80cm/2.55X1.26X1.10in(Fixing Ring) -Inner Diameter:25-28mm -Simple and to fix your sinking office chair. Installation takes only few minutes, easy to install. -The height of the chair can be adjusted and fixed according to your needs, bringing a comfortable seating experience to you. -Made of stainless steel and rubber material, which has strong load-bearing capacity, more practical and effective, not easy to break or crack. -It takes about few minutes but once done your chair will no longer drop down. -Easily solve your chair sinking problem without spending more money on a new chair. Package list: 1 x Fixing Ring 1 x Wrench