The Dot Line Corp. 5.5 In. Mini Arm With 1/4 X 20 Post feature all metal construction and two ball joints controlled by one lock. Each joint allows 360 degrees rotation and 180 degrees tilt. The foot has a built-in lock and features a female 1/4-20 thread. One arm has an adjustable shoe on the top and the other has a 1/4-20 threaded post and platform. It measures with 1/4-20 post, measures approximately 5-1/2 inches high.