EASY INSTALLATION - First, Drill a 2 deep hole using a 1/2 drill bit( if furniture legs made by hardwood or legs size less than 1 5''*1 5'', pls use 9/16" drill bit instand ) Second, Screw the threaded socket into the hole using a 3/8 hex key Finally , Screw in the leveler to desired height STRONG & STURDY COMMERCIAL QUALITY - It also supports 90 lbs lb of load (with a 360 lbs total capacity for all four levelers), making them suitable for many applications commonly found in homes, kitchens, garages, workshops, offices, restaurants, and shops 4 PACK WITH THREADED SOCKETS - Set of 4 and adjustable furniture leveling feet with zinc plated threaded socket These furniture levelers are 100% guaranteed to resist and bending or flexing under load Made of 100% Solid Steel and Thick High-Density nylon base Sturdy base Diameter and Fully adjustable thread for maximum support and better adjustable The black felt was under the levelerIt can keep quite MULTITUDE OF USES - Our adjustable leg levelers can be placed on tables, chairs, shelving units, kitchen cabinets, plant stands, and so much more Whatever your home or workplace needs assistance making leveled, our leg levelers are a quick fix while not compromising the look