Noga MG61003 Heavy Duty Dial Gage Magnetic Base w/Metal Fine AdjustRigid, Steel Arm Has unique central locking mechanism with spring loaded bearing for easy set up Easy to set up gages into required position Fine adjustment universal swivel clamp New fine adjustment on top with universal swivel clamp. Holds 6mm, 8mm, 3 8, dovetail and back lug. Central locking mechanism with NOGA designed spring loaded bearing. Five axis holder. Powerful 180LBF. on off magnetic base. Instant fixation in any position. Fast and easy to