Magnetic-Base Indicator Holder Arm Type Rigid Base Height 55 mm Base Length 58 mm Base Size 58 mm L x 50 mm W x 55 mm H Base Type Magnetic Base Width 50 mm Compatible Indicator Mounts 6 mm Fine Adjustment Position Fine Adjust Top (FAT) Holding Power 600 N Maximum Reach 232 mm Step Type V Step Working Length of Post/Lower Arm 55 mm Working Length of Snug/Third Arm 177 mm Working Length of Upper Arm 150 mm Base Thread Size M8 x 1.25 Includes Snug Yes Magnet Type On/Off Knob