Patent ID: 8052359

Claim:
A countersink assembly comprising: a countersink sleeve body with a distal cutting edge, a longitudinal bore through the countersink sleeve body to receive a drill bit, at least one flute extending from the distal cutting edge along at least a part of an outer surface thereof, and a mechanism for selectively securing the countersink sleeve body to a drill bit disposed in said longitudinal bore; and a depth stop collar having a longitudinal bore to receive and be slidable along the countersink sleeve body, and a mechanism for selectively securing the depth stop collar to said countersink sleeve body disposed therein, wherein at least one of the longitudinal bore of the depth stop collar and the flute is configured such as to allow chip egress at least one of 1) radially through the depth stop collar and/or 2) axially between the at least one flute and the depth stop collar toward a proximal end of the assembly, and further including at least one longitudinally extending flat defined on an outer circumferential surface of said countersink sleeve body for engaging said mechanism for selectively securing the depth stop collar to said sleeve.