Dual Calm Shell - Powder coat - Clam Shell features the following hole patterns: AMPS, NEC and 75mm VESA; Clam Shell can be tilted up or down for a total of 160; To tilt the Clam Shell simply loosen the adjustable lever, tilt to desired position and then re-tighten the lever; A secondary bolt is included to lock the clam shell into a permanent position Plate sandwiches the overhead guard leg and allows user to position the device at the desired height position; Heavy gauge steel construction for long-term durability in a rugged environment; Black powdercoat finish for maximum corrosion resistance