This is a single piece of 1-1/4" 1' Speed Rail made of 6061-T6 Aluminum. This is schedule 40 aluminum tubing, very common on movie sets because it has so many uses. Filmtools stocks a variety of fittings and accessories for this size of Speed Rail (see below). This size speed rail can also be used as track with some dollies such as the Dana Dolly.
Please Note: When buying speed rail for the Dana Dolly, two sections of (approximately equal length) speed-rail are required.