Description:1. Material: The tube plug nut is made of black plastic, with thread, can be fitted with casters and adjustable pads, has an adjustable height, is not easy to deform, and has more stable support.2. Effect: The thread tube plug can choose caster installation for easy movement; choose adjustable feet for balance, protect the floor, and be anti-skid and noise reduction.3. Easy Installation: The chair leg plug comes with ribs, only requiring lining up with the before tapping it into position. ribs provide a secure fitting and prevent the need for additional adhesives.4. Application: The nut plug is for office or household furniture. such as mechanical equipment, fitness equipment, racks, tv stands, table, shelves, beach chairs, desk legs, and so on.Specification:Product Name: End Caps Insert PlugsMaterial: PlasticInner Height: 18mm/0.71"Overall Height: 23mm/0.91"Thread Size: M8*1.25Overall Size: 50x50mm/1.97"x1.97"(LxW)Package Includes:12 x Threaded Tube Inserts (Does Not Contain Adjustable Leveling Legs)