Patent ID: 7204244

Claim:
A diamond core drill bit comprising, a nickel-plated body in the form of a right-circular cylinder and having a plurality of grooves creating an uneven, wave-like bonding surface, said grooves being parallel to each other and axial in height extending from at least one bottom circumferential sidewall of the body; diamond grit bonded around the bottom circumferential edge of the body on a portion of the internal and external sidewalls wherein the diamond grit is bonded over a portion of the axial height of the grooves so as to create multi-directional bonding forces between the diamonds and the bonding surface; a nickel-plated cap at the top of the body having a central lubrication hole; and, a nickel-plated hollow shaft mated to the cap over the central lubrication hole wherein a lubricant can flow through the hollow shaft and into the internal volume of the body and out the side lubrication hole.