Size - 12pcs furniture levelers for each package. Inch coarse thread, 1/4"-20 UNC. Look at the second picture in the image to get specific details. Please check the size carefully to make sure that it is suitable for your replacement. Material & Function - No shaking! The furniture leveling feet is made from galvanized steel and a black PP non-skid base. Adjustable the leveling feet quickly and easily to the balanced height. Keep your furniture and floor from being scratched and damaged, and reduced noise while moving furniture. The adjusted range of the table leveling feet is between 1/4" and 3/4" in height and supports more than 200 pounds per product. Easy Installation - For furniture legs with existing 1/4”-20 thread, simply screw in the leg leveler to adjust the height. Otherwise need to pre-drill a 5/16” hole and insert the t-nut for universal installation, and then screw in the Levelers and adjust to the desired height. Note: Adjustable furniture feet recommends for wood furniture with a leg diameter greater than 1". If less than this size, there is a risk of cracking during installation. THE PACKAGE NOT INCLUDED T-NUTS! Wide Application - The adjustable furniture feet can be widely used on indoor, patio, and outdoor furniture feet to level them to the same height flexibly, such as tables, chairs, kitchen cabinets, stools, dressers, patio, and outdoor furniture, bar, and restaurant tables and chairs feet. Suit for all types of floor including wood, tile, and carpet.