These white plastic inserts are made to be inserted in your bed frame to allow the correct fit for your casters, rug rollers, or wheels 5/8" Outside Diameter 3/8" Center Hole 1-9/16" Stem Length Made of High-Strength, HDPE Plastic Application These white plastic inserts are made to be inserted in your bed frame to allow the correct fit for your casters, rug rollers, or wheels. Item # 128*CS-26-10 Approximate Dimensions 5/8" Outside Diameter 3/8" Center Hole 1-9/16" Stem Length Made of High-Strength, HDPE Plastic How Sold This item is sold in sets of four. Thus, selecting a quantity of 1 will result in 1 set of 4 plugs being ordered. Selecting a quantity of 3 will result in 3 sets of four plugs in each set (12 plugs total) being ordered. Large Square Plastic Bed Frame Insert Plugs, 7/8" Outside Diameter- Set of 4