Rectangular Tubing Plastic PLUGS - Ribbed Flex Inserts -Multi Sizes and Gauge.         Features a series of tapered ribs which ensures a secure fit perfect for use on a wide range of metal furniture, appliances and similar items. The exterior ribs are designed to provide a sure grip inside a tube. locking rib design allows these plugs to fit most inside diameters         Durable construction and excellent gliding edges. Not subject to rust or corrosion. High quality heavy duty thick wall plastic finishing plug Made with High Grade Low-Density Polyethylene.         For Fencing Posts, Furniture End Caps, Fitness Equipment End Caps         Flexible ridges snugly hold these plugs in place. Positively Angled locking rib design allows these plugs to fit most inside diameters         For Un-threaded Surface Type with Straight Profile         Maximum Temperature 150 ' F.         Hardness: Durometer 50D. Maximum Temperature 150 F