*5/8 shank diameter. *Secure, center locking bolts. *Accepts standard 1/2 bushings. *Through hole in shank for deep drill insertion. *Head adjusts for exact centering. *Hardened alloy steel hardware. *Bushing type holders allow clamping along any part of the drill. *Once locked on center this tool provides a rigid platform for positive drilling action. Also useful for small drill operations to achieve accurate centering.
