Ground engaging tool

A lock (60) for a ground engaging tool (30) may have a head portion (80) with at least one compressible detent projection (67). The lock may also have a C-shaped skirt (63) extending from the head portion. The skirt may define a lock slot (62) for receiving a post (23) to be locked with the ground engaging tool. The tool may have an interior surface (100). The tool may also have an exterior surface (101) defining a front edge (31) of the tool. In addition, the tool may have a rear surface (102) substantially opposite the front edge. The rear surface may connect the interior surface to the exterior surface. The tool may also have a lock opening surface (104). The lock opening surface may define a lock opening (40) extending from the interior surface, through the tool, to the exterior surface. The lock opening surface may have a generally circular inner portion (105) adjacent the interior surface. The inner portion may define a groove (107) in the tool positioned circumferentially around the lock opening. In addition, the inner portion may define at least one detent recess (77) in the tool along the groove. The lock opening surface may also have a generally circular outer portion (106) adjacent the exterior surface.