Product includes: You will get 16 pieces adjustable office chair levelers and 16 pieces T-nuts, enough quantity for your daily use.Product dimensions: Threaded rod is 18mm long, the round base is 22mm in diameter. Please check the size before purchasing to avoid unnecessary trouble.High quality material: The screw base in the chair legs is made of PP material, which is wear-resistant, non-slip, sturdy and durable, protect your sofa, cabinet from scratches, keep furniture balanced and provide good shock absorption.Wide Application: The furniture leveling feet are adjustable, you can adjust the height according to your needs, avoid direct contact with the ground to protect your floors, carpets and tiles. Works on wood, laminate, hardwood, tile, carpet and more.Warm Tips: Installation requires drilling and inserting T-nuts, so it is suitable for furniture legs with a diameter greater than 25 mm. If the size is too small, there is a risk of cracking during installation. In addition, it is used for wooden furniture, and metal furniture legs require welding or thread riveting, which cannot be used by non-professionals.