Dimension: Fit for 2" x 2", 50 x 50 mm square tube, if your square tube is 2" x 2", 50 x 50 mm, then this size will fit. Leveling Foot Base Size: With M8 thread design. M8 x 21 mm (D x H); Foot Diameter: 28 x 10 mm(D x H). Fully adjustable from 15 mm to 25 mm for maximum support and adjustability. Product Material: PE plastic and zinc-coated screws, which is a sturdy material with wear-resistant, no pungent smell, not easy to break. Smooth bottom of plastic pipe plugs can reduce resistance and allow easy, smooth movement of furniture without lifting, protect your floors and furniture while increasing flexibility in furniture movement. Feature: This adjustable pipe plug product can easily level furniture, adjust the height according to needs, and avoid furniture shaking. And prevent scratches, reduce noise, easy sliding, protect your furniture and floor; Package Content: 4 x Leveling Feet, 4 x Tube Inserts. Meanwhile, we are committed to providing quality product and service to our customers, any questions please feel free to contact with our customer services. ◆Specification: Product Name: Plastic Tube Inserts Material: PE Plastic and Zinc-Coated Screw (Durable and Wear-Resistant) Shape: Square Size: M8 x 50 mm x 50 mm Color: Black Package Content: 4 x Leveling Feet, 4 x Tube Inserts ◆Characteristic: 1.Prevent scratches, reduce noise, easy sliding, protect your furniture and floor; 2. Adjust the height of the table and chair frame as needed. ◆Note: These plastic plugs are measured according to the Outside Diameter of your chair legs, please measure the size of the chair legs and choose the appropriate size for your chair legs. ◆QUALITY GUARANTEE: If you have any questions during the purchase and the shipment, please contact us, we will try our best to assist for you.