HMT Versadrive 4mm Left Hand Cobalt Drill bits for M5-6 Stud Extractors Cobalt (No 3)

Premium specification drill bits with left-handed spiral flute.
8% Cobalt with advanced TiAln coating to reduce friction and heat generation.
Can be used both on Rotary and Impact settings.
To be used for drilling the pilot holes in broken bolts and seized studs ready for VersaDrive® Bolt extractors.
Designed to run in reverse to help loosen the seized item at the same time as creating the pilot hole.