We, Mighty 8 Stores, are the sole agent of Selta in Australia!

Selta brand, original from Taiwan, professional tools. 

Chrome-Molly adapter knuckle head black phosphate finish

The breaker bar head or knuckle head is designed to break before the bar snaps. Take this spare heads, repairing the bar only takes about 2 minutes.
Two options: 1/2" Dr. head; 3/4" Dr. head.
The thickness of fixing head: 1/2" Dr.-12.8mm; 3/4” Dr.-19.5mm