HAVIS's C-MD-114 11 in slide out locking swing arm. Slide out extends up to 3.75 in with smooth gliding action to lengthen arm from 11.25 in up to 15 in. 360 deg. of smooth rotation for ideal computing device viewing angles from both the driver and front passenger seats. Material: rugged heavy gauge black powder coated steel and machined 6061 aircraft aluminum for strength, durability, and rust prevention. Mounting pattern: 4 hole at 2.125 in square (1/4 in mounting hardware provided).