a fastener including a drive head and a threaded shank, one end of said threaded shank extends from a bottom of said drive head, a drive cavity is formed in a top axial surface of said drive head; and

a lock key including a head and a shank, said shank extends downward from a bottom of said head, at least one shank projection extends outward from a front of said shank, a head projection extends outward from a rear of said head, a key slot is formed in a side of said drive head and said threaded shank, said key slot is sized to receive said lock key, a head retention slot is formed in said key slot to receive said head projection, where in use said fastener is inserted through a first object and tightened in a threaded hole of a second object, and said lock key is inserted through said top axial surface of said drive head into said key slot to prevent rotation of said fastener, where in use said head projection is locked in said head retention slot to prevent upward movement of said lock key.