This really useful set of ten Tungsten Carbide Burrs can, if used with care, be used to remove broken off hardened steel drill bits or stud extractors.
Please note great care has to be taken when trying to remove a broken hardened drill bit or stud extractor using these burrs as the hole threads in aluminium cylinder head could be damaged and then further repair would be required.
Safety eyewear must be worn when using these burrs WITHOUT FAIL.