Space Clamp Large Size: 27.25" (69.2 cm) long Complete with Large Bar, 2 Clamping Arms, Stud Bracket, 2 Knobs. These clamps lock onto posts, beams, and objects with spans from 25" to 8' to support one or more lights, flags, etc. The bars, made of high-strength aircraft aluminum alloy, come in two sizes and interlock without tools to adjust to various breadths. They can also reverse and jack out to clamp between objects (not recommended with 2 or more bars interlocked). Stud bracket locks onto any part of Arm. Space-clamps also accept Tota-tilter and Lobo for a variety of accessories.