Bestyet Flex Indicator Stand Features include... 10" Arm Reach Instant fixation in any position. Single knob controls all three joints. Heavy-duty mechanical lock. Sturdy aluminum arms for maximum rigidity. Fine adjustment. Fits dovetail and 3/8" stem indicators. Mounting thread M8 x 1.25 mm. Magnetic base has 175 lbs. of pull, vacuum base has 3-1/2" dia.