Patent ID: 7632050

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 comprising at least two insert attachment seat portions; a first drilling insert being selectively attached to the first end of the holder; and at least two secondary drilling inserts attachable to the at least two insert seat attachment portions of the intermediate portion of the holder wherein each of the at least two secondary drilling inserts comprises at least four cutting edges adapted to form a port seal in a single cutting operation, a first register surface forming a seating surface for the at least two secondary drilling inserts, a second register surface forming a radially inward seating surface for the at least two secondary drilling inserts, and a third register surface forming a back seating surface in relation for the at least two secondary drilling inserts to the first register surface and the second register surface; wherein the first and secondary inserts are replaceable and non-indexable.