HAVIS's C-MD-112 11 in slide out locking swing arm with motion adapter. Slide out extends up to 3.75 in with smooth gliding action to lengthen arm from 11.25 in – 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).