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. Includes 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 & Sturdy Heavy-duty leg levelers for easy leveling of furniture in homes, offices, restaurants, schools, or cafes. Provides stable support for heavy furniture, allows height adjustment, and facilitates smooth 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.