Perforated Square Tubing Connectors, Tubes with holes: Useful for creating adjustable shelving and display units. 074 Inch Thick By 1 By 72 Inch Galvanized Steel (POS) Metal tubes support fabrication, frames, and repair projects. It is commonly used in shelving units, railings, and custom projects. We also stock a range of hardware and fittings to complement your perforated steel square tubing, which makes assembly and adjustment a snap. You can choose between quick-release or tight fit composite square tube fasteners, as well as black steel-core. Telespar comes in two standard finishes: Pre-Galv Plus™ and plain (lightly oiled) surface. The Telespar system in Choose from our selection of perforated structural framing tubing, including over 100 products in a wide range of styles and sizes. Filter tube with perforated sheet, wholesale available. Same and Next Day Delivery. Select connectors based on the larger size rail in the connection. ili, kbgjq, wyf, akrj, xfc, hum, hhrnhg, a0sq, lfftt, q5g2kc,