Casters of this size are often referred to as “bed casters” because of their strength and size. The large 1 3/4″ steel wheels supported by cast iron holders and stem can support a lot of weight. The stem that inserts into the leg is,2 2/8 inches long and is 3/8 inches thick at the base. The lift to the bed or piece of furniture after inserting the casters is about 2 inches. We have oiled and inspected these casters, which are in excellent shape.