1320LBs max support. Commercial quality furniture levelers, T-nuts, and thread inserts are made of steel. Each leg can support 330LBs, so a set of four can support up to 1320LBs. Universal design: Adjustable leg levelers can be installed on tables, chairs, cabinets, workbenches, and more. Features a universal nylon bottom that works on all floor types, including hardwood, tile, and carpet. Comes with 8 high-density felt pads to protect floors from scratches and reduce noise. Adjustable leveling feet: Sturdy 1.75-inch long steel insert with 3/8-16 thread for maximum support and adjustability. Commercial-quality large base with 1-3/8-inch diameter and 1/2-inch thickness. Fully adjustable height from 3/4 inch to 1-3/4 inches. Practical and sturdy: Heavy-duty leg levelers provide easy leveling for furniture in homes, offices, restaurants, schools, or cafes. Helps support heavy furniture, adjust furniture height, and allows for easier sliding. Easy installation: Pre-drill a hole with a diameter of 1/2 inch and depth of 1-1/2 inches into the furniture leg, then insert the T-nut, screw in the leg leveler, and adjust to the desired height. For furniture legs with existing 3/8-16 threads, simply screw in the leveler and adjust.