The Jerry Stage JS-BH180 Adjustable Plate-Hinge Truss Plate 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 ProX 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. ProX Truss products utilize industry standard dimensions to be compatible to connect to/with many other manufacturers trussing. The Jerry Stage JS-BH180 is the first trussing hinge from Jerry Stage that adjusts from 0° to 180° for unique truss construction projects. There is a built-in adjustable arm to lock the desired angle between sections of truss and Junction Boxes. The superior construction quality of Jerry Stage trussing products guarantees many years of trouble-free use. 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. Jerry Stage JS-BH180-BLK Adjustable Bookhinge Features: Manufactured in Jerry Stage‘s own Factory. Allows angles not possible with standard trussing corners. One Side Conical Couplers Included. Material: 10mm EN-AWT6 6061 Aluminum. TUV Certified Aluminum Welding.