The bottom of the adjustment foot is made of nylon, very quiet when rubbing against the ground, your furniture will no longer squeak and scratch the floor. Easy to install, the screws have deep threads, easy to fix, not easy to fall off. After fixing, the height can be adjusted according to your needs. The galvanized screws are strong and durable, and the plastic bottom can effectively prevent wooden table legs and chair legs from being corroded by moisture. Adjust the unstable legs of the chair into an even horizontal line to keep the balance. A good helper for DIY and furniture repair, suitable for furniture, shelves, wooden workbenches, desks and office chairs, etc. Size: 4 adjustment feet, screw size is M10 x 50mm, base diameter: 38mm