A spine implant comprising: a plate ; a plurality of bone screws ; and a plurality of setscrews ; the plate having a plurality of bores each one configured to receive one of the plurality of bone screws , and a threaded pocket adjacent each one of the plurality of bores for receiving one of the plurality of setscrews ; each one of the plurality of bone screws having a head and a threaded shaft extending from a lower side of the head; each one of the plurality of setscrews having a body with: a head , external threading on a lower portion of the body that is configured for threaded reception in one of the plurality of threaded pockets of the plate , external teeth on an upper portion of the body between the head and the external threading , and a flat on a side of the body and extending through a portion of the external teeth and the head ; each setscrew having: a first rotational position when installed in a threaded pocket of the plate wherein the external teeth of the setscrew engage the head of a bone screw situated in an adjacent bone screw bore such that backout of the bone screw is prevented, and a second rotational position when installed in a threaded pocket of the plate wherein the flat of the setscrew is adjacent the bore such that a bone screw can be inserted into or removed from the bore without restriction by the external teeth of the respective setscrew . a plate ; a plurality of bone screws ; and a plurality of setscrews ; the plate having a plurality of bores each one configured to receive one of the plurality of bone screws , and a threaded pocket adjacent each one of the plurality of bores for receiving one of the plurality of setscrews ; each one of the plurality of bone screws having a head and a threaded shaft extending from a lower side of the head; each one of the plurality of setscrews having a body with: a head , external threading on a lower portion of the body that is configured for threaded reception in one of the plurality of threaded pockets of the plate , external teeth on an upper portion of the body between the head and the external threading , and a flat on a side of the body and extending through a portion of the external teeth and the head ; a head , external threading on a lower portion of the body that is configured for threaded reception in one of the plurality of threaded pockets of the plate , external teeth on an upper portion of the body between the head and the external threading , and a flat on a side of the body and extending through a portion of the external teeth and the head ; each setscrew having: a first rotational position when installed in a threaded pocket of the plate wherein the external teeth of the setscrew engage the head of a bone screw situated in an adjacent bone screw bore such that backout of the bone screw is prevented, and a second rotational position when installed in a threaded pocket of the plate wherein the flat of the setscrew is adjacent the bore such that a bone screw can be inserted into or removed from the bore without restriction by the external teeth of the respective setscrew . a first rotational position when installed in a threaded pocket of the plate wherein the external teeth of the setscrew engage the head of a bone screw situated in an adjacent bone screw bore such that backout of the bone screw is prevented, and a second rotational position when installed in a threaded pocket of the plate wherein the flat of the setscrew is adjacent the bore such that a bone screw can be inserted into or removed from the bore without restriction by the external teeth of the respective setscrew . <EOS>