Magnetic-Base Indicator Holder Arm Type Articulating Base Height 2 13/64 in Base Length 2 23/64 in Base Size 2.362 in L x 1.969 in W x 2 1/5 in H Base Type Magnetic Base Width 1 31/32 in Compatible Indicator Mounts 3/8 in Fine Adjustment Position Fine Adjust Top (FAT) Holding Power 220 lbf Maximum Reach 19.213 in Step Type V Step Working Length of Post/Lower Arm 7.717 in Working Length of Snug/Third Arm 2.953 in Working Length of Upper Arm 6.575 in Base Thread Size M8 x 1.25