Magnetic-Base Indicator Holder Arm Type Rigid Base Height 1 1/2 in Base Length 2 1/4 in Base Size 2.244 in L x 2 1/4 in W x 1 1/2 in H Base Type Magnetic Base Width 2 1/4 in Compatible Indicator Mounts 3/8 in Fine Adjustment Position Fine Adjust Top (FAT) Holding Power 132 lbf Maximum Reach 12.993 in Step Type Flat Working Length of Post/Lower Arm 7.087 in Working Length of Upper Arm 5.906 in Construction Steel Includes Snug Yes Magnet Type Always On Screw Type Knob