Piloted Core Drills for Sunnen / Tobin-Arp

Sunnen and Tobin-Arp core drills have a 1/2" Round Drive with a Flat

Piloted valve guide core drills are manufactured from High Speed Steel and intended to be used in a Valve Guide and Seat Machine, Bridgeport style machine, or bed mill.

Valve guide core drills are designed to be used with valve guide core reamers to achieve a final size finished size for press fit guide installation.