Metal bonded drilling and boring tool

A metal bonded drilling and boring tool comprising:

• a rod-shaped body having a substantially semispherical front end portion;
• numerous abrasive grains bonded to an outer circumferential surface of said rod-shaped body at said front end portion and at a portion having a given length from said front end portion by a bond member formed primarily of copper alloy;
• said bond member containing a material selected from the group consisting of Ti, Al, and a mixture thereof;
• an average abrasive grain projection height being set to 30% or more of an average abrasive grain diameter, where said abrasive grain projection height is defined as a distance between the surface of a deepest portion of said bond member present between any two adjacent ones of said abrasive grains and the top of each of said two adjacent abrasive grains;
• and
• an average abrasive grain spacing being set to 200% or more of said average abrasive grain diameter, where said abrasive grain spacing is defined as a distance between the tops of said two adjacent abrasive grains.