This 4 inch aluminum Mount has teeth within the interlocking joints providing a very strong connection. It can be used in a variety of vehicles or fixed locations to mount a wide variety of products such as tablets and mobile computers. – These come in 2, 4, 6, 8 and 10 heights with and AMPS base and top and can be purchased in complete sets or as individual pieces. – The design allows you to mix and match the parts to create your own unique design/solution.