HHIP zero-set universal Kit is designed for Test indicator with Dovetail or 1/4" post and functions as a quick and practical work positioning device setting up a work piece before machining, or aligning the center of a round work piece in relation to the cutting head, takes virtually no time with "zero-set" the hardened clamping post consists of three O.D.'Use (1/4, 3/8 and 1/2") it reaches anywhere within a 8" diameter and fine-adjusts about 3/8" with knob.