Professional breaker bar head for commercial or occasional use 1/2" drive breaker / power bar head replacement 1/2" drive power knuckle bar head suitable for most bars Manufactured from chrome vanadium steel for strength and durability Black phosphate finish for rust and corrosion resistance Suitable for all 1/2" drive power bars no matter what the make or model Suitable for the bars with an end on the handle Comes complete with fixing bolt and spring washer to keep the head rigid Total gap between the holes 12mm 1/2" square drive