Here's a mid 1950s hardware product still in the box! Levelor, as the box states, are "New Adjustable Plastic Castors That Keep Furniture Level!" The box contains 4 pieces and were recommended for tables, chairs, cabinets, etc. They are round, two pieces, made of Lucite, and screw into the leg or bottom of whatever needs leveling. Once secured, the outer portion turns and adjusts to raise or lower height. Both box and castors are in excellent, never used condition! The box is red and white with wonderful, period graphics. Original directions are included inside. If you like miniatures, the castors themselves resemble little bar stools! Cool old stock item!