Heavy Duty & Large Furniture Leg Levelers- Allow easy leveling of furniture at home, office, restaurant, school or caf, to match in same height. They allow raising your furniture, and help slide your furniture at ease ! Adjustable Leveling Feet - 1.75 long steel insert with 3/8-16 thread; Large Commercial Quality 1 3/8" Diameter 1/2 Thick Base and Fully Adjustable Height from 3/4 to 1 3/4 for Maximum Support and Adjustability. Heavy Duty & 1320LBs Max Support- Commercial quality furniture levelers, T-nuts and thread insert are made of steel that support over 330LBs per feet, so a set of four can support furniture 1320LBs! For All Floors- Universal Nylon bottom that work for all floors such as hardwood/tile/carpeting floors. Comes with separate high density thick felt for hardwood floor to protect floor from scratches or harsh noises. Easy Installation- For furniture legs with existing 3/8"-16 thread, simply screw in the leg leveler to adjust the height. Or, pre-drill a 1/2 hole and insert the t-nut for universal installation, screw in the leg levelers and adjust to the desired height.