Rawlbolt stuck in hole - bolt snapped in two

[gmc600]

Looking for some advice, I was tightening a Rawlbolt into concrete block wall and the bolt snapped in two. Any suggestions for how I can get the rest of the rawlbolt out so I can try again with a new one? Annoyingly this was the last of three and no issues with the other two so don’t really want to have to drill three new holes and use three new bolts next to these three.

 

[JohnD]

left handed drill. Start with a small one, dead centre, and increase until (if necessary) you can get an extractor in.

However, the vibration and torque of the drill often winds a screw out.

 

[cdbe]

Tap the inner part deeper into the hole and pull the outer part out with needlenosed pliers.