Patent ID: 7771143

Claim:
A drill bit assembly, comprising: a drill bit comprising a plurality of drill stop grooves established therein; and a drill stop sleeve having a hollow cylinder configuration wherein the drill bit is placed therethrough, the drill stop sleeve comprising a locking collar and a locking arm, the locking arm having a proximal end and a distal end wherein the thickness of the locking arm increases from the proximal end to the distal end, wherein the locking collar is movable in a linear direction on the drill stop sleeve between an unlocked position in which the drill stop sleeve is movable along the drill bit to one of a plurality of drill stop depths and a locked position in which the drill stop sleeve is locked along the drill bit in one of the plurality of drill stop depths; and wherein the locking arm is configured to engage one of the plurality of drill stop grooves when the locking collar is in the locked position.