Mini Magnetic-Base Indicator Holder Arm Type Articulating Base Height 25 mm Base Size 30 mm W x 25 mm H Base Type Magnetic Base Width 30 mm Compatible Indicator Mounts 3/8 in Holding Power 200 lbf Maximum Reach 87.5 mm Step Type Flat Working Length of Post/Lower Arm 38 mm Working Length of Snug/Third Arm 21.5 mm Working Length of Upper Arm 38 mm Base Thread Size M5 Construction Aluminum Includes Snug Yes Magnet Type Always On Screw Type Plastic Knob