A spine implant comprising: a plate; a plurality of bone screws; and a plurality of setscrews; the plate having a plurality of bores (32, 34, 38, 40, 44, 46) each one configured to receive one of the plurality of bone screws, and a threaded pocket (33, 35, 39, 41, 45, 47) adjacent each one of the plurality of bores (32, 34, 38, 40, 44, 46) 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 (33, 35, 39, 41, 45, 47) 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 (33, 35, 39, 41, 45, 47) 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 (33, 35, 39, 41, 45, 47) of the plate wherein the flat of the setscrew is adjacent the bore (32, 34, 38, 40, 44, 46) 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 (32, 34, 38, 40, 44, 46) each one configured to receive one of the plurality of bone screws, and a threaded pocket (33, 35, 39, 41, 45, 47) adjacent each one of the plurality of bores (32, 34, 38, 40, 44, 46) 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 (33, 35, 39, 41, 45, 47) 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 (33, 35, 39, 41, 45, 47) 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 (33, 35, 39, 41, 45, 47) 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 (33, 35, 39, 41, 45, 47) of the plate wherein the flat of the setscrew is adjacent the bore (32, 34, 38, 40, 44, 46) 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 (33, 35, 39, 41, 45, 47) 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 (33, 35, 39, 41, 45, 47) of the plate wherein the flat of the setscrew is adjacent the bore (32, 34, 38, 40, 44, 46) such that a bone screw can be inserted into or removed from the bore without restriction by the external teeth of the respective setscrew.