Spindle-Mounted Indicator Holder Arm Arm Type Articulating Compatible Indicator Mounts 3/8 in Fine Adjustment Position Fine Adjust Top (FAT) Maximum Reach 14.96 in Working Length of Post/Lower Arm 7.283 in Working Length of Upper Arm 7.677 in Construction Steel Includes Snug Yes Screw Type Plastic Knob Centering Arm Shank Size 3/8 in (Dia) Centering Arm Shank Type Straight