16pcs Non-Slip Rubber End Caps for Table Legs and Tubular Feet 19 or 20mm - Black - The size refers to the outer diameter of the pipe on which the ferrule is to be mounted. For measuring, a ruler may be more accurate than a tape measure Durable: with thick rubber sides and an internal reinforcing ridge Ideal for replacing the rubber ends of chairs, tables, ladders, ironing boards and other furniture legs, renew your old worn items, reduce noise and protect your floors