The Leveling Foot is for office or household light duty furniture with threaded sockets.Adjustable thread design,and the square insert thread is 19mm x 19mm(L x W).Plastic round base design will do no harm and scratches to your floors.Easy to install of it and adjustable height as your require.This Furniture Glide Leveler is typically used on conference room tables, heavier desks, restaurant furniture and point of purchase display racks.