Clevis - Powder coat - The entire arm can rotate around 360 degrees and the Motion Attachment can also rotate 360 degrees Arm extends 3 bringing equipment closer to the user; Arm can be tighten down to be locked into a permanent position; Clam shell features the following hole patterns: AMPS, NEC, 75mm VESA, Gamber-Johnson 2x 4.09; Can be mounted directly to any Clam Shell (7160-0357, 7160-0370, 7160-0371); Heavy gauge steel construction for long-term durability in a rugged environment; Black powdercoat finish for maximum corrosion resistance