The HD frame is constructed with heavy duty 1" square 18-gauge steel and 1-1/8" square corners and legs for outstanding durability and stability. The Quick-Snap™ connection allows screen frames to be assembled in minutes and without the use of any tools. Protect workers, material, and equipment from hazards of welding sparks, spatter, and UV flash.  The patented modular framing system offers more flexibility than any other screen on the market and provides the widest range of multi-panel configurations. The unique modular design allows addition, removal, replacement, and rearrangement of individual panels to adapt to new requirements in just minutes. Use individual panels or join together to form multi-panel enclosures or in-line dividers.  Sturdy square tube frame is designed to eliminate slipping and twisting that occur with round tube frames.