The Adjustable Book-Hinge Connection is from the most trusted staging support systems in the industry, and is built to the highest standards of safety and performance. It's a rugged yet lightweight trussing solution perfect for mobile DJs, bands, outdoor performances, nightclubs, live mobile productions, or permanent installations.   
 
It adjusts from 0° to 180° and fits 12" SQ F34 Conical trussing.  Manufactured from high-grade and lightweight aluminum which is easy for transportation and setup!  This product can provide a universal solution for truss angles. 
 
At the heart of the system is square truss that utilizes a standard conical connector system, which easily mates with other brands of trussing of the same size and connector style, and is available in a variety of lengths to suit your designs. It also works with different types of corners, base plates, connectors and accessories that add stability while expanding on limitless configurations.
 
Features
Allows angles not possible with standard trussing corners
Adjustable lock arm
Conical couplers included
Material: 10mm EN-AWT6 6061 Aluminum
TUV Certified Aluminium Welding