A metal bonded drilling and boring tool which can prevent the separation
of abrasive grains during drilling and boring to maintain a stable
working performance for a long period of time without the need for tool
exchange. The tool includes a rod-shaped body having a substantially
semispherical front end portion and numerous abrasive grains bonded to an
outer circumferential surface of the rod-shaped body at the front end
portion and at a portion having a given length from the front end portion
by a bond member formed primarily of copper alloy. The bond member
contains a material selected from the group consisting of Ti, Al, and a
mixture thereof. The copper alloy is selected from the group consisting
of bronze containing 10 to 33 wt % of Sn, brass containing 5 to 20 wt %
of Zn, and aluminum bronze containing 5 to 20 wt % of Al.