ALLOY STEEL MATERIAL; NICKEL CHROME PLATED FINISH; 4-3/8 INCH OVERALL LENGTH; OPEN SMALLER END TYPE; BOX LARGER END TYPE; 5/16 INCH SMALLER END SIZE; 5/16 INCH LARGER END SIZE; FORGED PROCESS; 12 POINT(S); 15 DEGREE X 15 DEGREE OFFSET ANGLE