1/8" 1/4" 3/8" 1/2" INNER DIA 1/8" 1/4" 3/8" 1/2" Inner Dia Black Vinyl Round End Cap Covers. 0.8mm/0.03-inch and 1mm/0.04-inch wall thickness. Please Note : Only suitable for BSW / BSF thread and M-type thread16mm, 17mm, 19mm, 23mm HEIGHTInner Dia*Height: 3mm x 16mm, 6mm x 17mm, 9mm x 19mm, 12mm x 23mm (Due to manual measurement, allow a deviation of 3mm)GOOD PROTECTOROur flexible end caps work great for preventing scuffs on the floor, as pliable protective seals for metal chair tips, patio furniture, bench feet, table legs or tips, bar stools, screw or nail heads, or to cover any round tubeSIZE SELECTIONBecause rubber material is soft and elastic, we recommend choosing rubber end cap that is slightly smaller than the outer diameter of the product to be protected. For example: the outer diameter of your product is 9.8mm dia, choose the rubber cover of 9.5mmWIDELY APPLICATION Perfect for covering screws or other threaded parts, round tubing, furniture feet and so on