Magnetic-Base Indicator Holder Arm Type Articulating Base Height 35 mm Base Length 40 mm Base Size 40 mm L x 30 mm W x 35 mm H Base Type Magnetic Base Width 30 mm Compatible Indicator Mounts 6 mm Fine Adjustment Position Fine Adjust Top (FAT) Fine Adjust Bottom (FAB) Holding Power 70 lbf Maximum Reach 178 mm Step Type V Step Working Length of Post/Lower Arm 56 mm Working Length of Snug/Third Arm 71 mm Working Length of Upper Arm 51 mm Base Thread Size M5 Construction Steel