Patent ID: 7942616

Claim:
A drilling tool comprising: a tool holder having a first end, a second end, and an intermediate portion between the first end and the second end, and a rotational axis therethrough, the second end comprising a shank portion, and the intermediate portion comprises at least one insert attachment seat portion; at least one first drilling member provided at the first end of the holder; at least one second drilling insert selectively attached to the at least one insert seat attachment portion of the intermediate portion of the holder, the second drilling insert comprising a first cutting edge generally parallel to the rotational axis of the tool for forming the inner diameter of a counterbore, a second cutting edge generally perpendicular to the first cutting edge for forming a bottom surface or spotface of the counterbore, a third cutting edge formed transverse to the rotational axis of the cutting tool for forming a seal angle, and a fourth cutting edge formed transverse to the rotational axis of the cutting tool for forming a chamfer, and the seat attachment portion having first, second and third register surfaces that mate with corresponding register edges and the back of the at least one second drilling insert; and wherein the at least one second insert is selectively replaceable and non-indexable.