UKAS 
Accredited Tool
 Calibration
 & Repair
							 
						 
							
						 
						 
							
						Chrom-vanadium-steel, 54 HRC
Operation:
Drill a central hole into the broken bolt
Turn the bolt extractor to the left into this hole until it grips and removes the bolt (penetrating oil may be necessary!)
Select screw extractors as large as possible