Check the following URL for complete description.  The price in Amazon is 80 USD Including Shipping.

Fits all screens up to 32 inches and 14.3 pounds with 75x75mm or 100x100mm VESA square bolt hole patterns, which are found on the back of your tv / monitor (if unsure of size, measure distance between bolt holes in millimeters).

FEATURES: Wall monitor mount is counterbalanced with gas spring arms which make for effortless adjustment and comes with integrated, hide-away cable management. Sturdy steel construction will stand the test of time and the rigors of the road if used in a camper or RV.

FULLY ADJUSTABLE: Single VESA wall mount can tilt, swivel, raise and/lower – and screen has 360 degree rotation. Turn hex bolt on top of computer monitor arm to adjust the gas spring tension to hold screens in place (please see 5th image down or instructional video for reference).

EASY INSTALLATION: Wall mount monitor arm comes with all mounting hardware (anchors included! ), tools, and instructions necessary for assembly. Needs a single stud for mounting and quick attachment VESA plate gets screwed into the back of the screen, then slips onto the arm in seconds. See instructional video for additional tips on functionality and assembly. Key Product Features