New fine adjustment on top with universal swivel clamp. Holds 6mm, 8mm, 3/8", dovetail and lug back. Central locking mechanism with NOGA designed spring loaded bearing. Five axis holder. Powerful 180 lbs. ON/OFF magnetic base. Instant fixation in any position. Fast and easy to set up gauges into required position. Black finished arms. Total length of arms 8-1/2"