Heavy wall polyethylene plugs for standard rectangular tubing are designed to fit multiple tube gauges and provide a secure fit. Poly tube plugs are ideal for office and patio furniture tubular racks appliances exercise equipment or anywhere a finished look is needed. Tube plugs include multiple horizontal ribs designed with built in flexibility for an easy install and a secure fit. Multiple ribs for a secure fit and heavy end walls for durability and abrasion resistance. (Tube Wall ... 14-20ga (.083" - .035") 0.8mm - 2.1mm).