Amazon.com: Monoprice 8in x 8in Lite Duty Box Truss, 6-Way Corner with Hardware, Up to 500 Pounds Max Load Capacity - Stage Right Series
Tomcat Box Truss 20" x 10' Black | Black, Rigging Equipment Rentals | 4Wall, Inc.
12" Box Truss
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Amazon.com: 4.92 ft. (1.5m) Aluminum 12"x12" 290mmx290mm Box Square Truss Trussing Segment. 2 mm Wall Includes 4 couplers! Fits All Major Name Brands! : Musical Instruments