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. 1320LBs Max Support- Commercial quality furniture levelers, T-nuts and thread insert are made of steel that support over 330LBs per feet, a set of four support furniture weight 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 Locknut with mounting screws ,stabilize the leveler and adjust to the desired height. T-nuts and installation screws are included.