8 Heavy wall polyethylene plugs for standard round 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. Multiple ribs for a secure fit and heavy end walls for durability and abrasion resistance. Dimensions are based on outside diameter of tubing (Height: .510" Tube Wall: 14-20 ga .035"-.083").