Global Truss products are top of line, professional grade trussing and accessories ideal for a wide span of applications ranging anywhere from stage and theatrical lighting to DJ set-ups and retail displays. Their truss bears the certification mark from TUV, a third party certification body and a nationally recognized testing laboratory (just like OSHA). In other words, their trussing is made from certified T-6082, high quality aluminum and steel which is the same material air planes are made of! This durable, yet lightweight, brushed aluminum is crafted so it both absorbs and reflects light giving your set-up a polished attractive appearance, as well as the strength and ruggedness you would expect from Global Truss. These square circular arch trusses are constructed with a heavy duty tubing that is 2" in diameter. These outer support beams are 11 7/16" apart and held together by sturdy 3/4" diagnal bracings. Includes two 180 degree segments.