New double Fine Adjustment: one on top with a universal swivel clamp and one unique single-direction Fine adjustment at the base. Holds 6mm, 8mm, 3/8", dovetail, and back lug. Unique central locking mechanism with Noga-designed spring-loaded bearing. The dial gauge holder is 3-dimensional. Powerful 180LBF. On/Off magnetic base. Instant fixation in any position. Fast and easy to set up gages into the required position. Black finished arms. Includes DG Arm, Zinc Cast fine adjustment, On/Off magnet plus fine adjustment. The total length of the arms is 8-1/2"