ALLOY STEEL MATERIAL; NICKEL CHROME PLATED FINISH; 5-1/8 INCH OVERALL LENGTH; OPEN SMALLER END TYPE; BOX LARGER END TYPE; 1/4 INCH SMALLER END SIZE; 1/4 INCH LARGER END SIZE; FORGED PROCESS; 12 POINT(S); 15 DEGREE X 15 DEGREE OFFSET ANGLE