Sealey Ak8189 Left Hand Spiral Drill Bit Set 5Pc

used these in conjunction with extractor set worked a treat

Just what I wanted to drill out some seized screws on my old MG, but even so it took a while using different size drills.Only criticism is that the bits didn’t stay sharp for very long.

good quality ,nice sturdy box, drilled into a snapped exhaust stud no problem, started with smallest and worked up to larger hole for removal tool . job done :)

These work great as long as you "always" start with the smallest bit and work your way up.

I bought these for the sole purpose of drilling out an exhaust manifold stud on an Aluminium head engine. The risk with right handed drill bits is that the remainder of the stud breaks free and ends up stuck further down the threaded hole.. With these the left handed motion should cause the remainder to unscrew out of the thread for removal. To do that they need in the first instance, to cut metal. The smallest bit did cut metal but the next size up was useless as was the next. Bigger sizes just rotated and no metal was removed. They seemed ok to start but quickly blunted and yes I did check that the drill was switched into the left hand turn undoing position. To check I went to my known right hand bits, selected a suitable size, switched to right hand mode and straight away metal was removed. Conclusion; these drill bits won't cut metal, it appears they are blunt or blunt very quickly. Given my own experience and looking at what others have written I would suggest a quality control issue so personally I will be avoiding their drills in the future.

Good

The 3.2mm bit was dull. Failed to drill into a broken bolt.

Managed to use these to remove one bolt and to drill the hole for an extractor to remove another.

l'acier est un peu tendre pour ce genre d'outil, il ne mord pas dans l'inox

ottime

Discrete. Avrei preferito qualche punta piccola in più. Ho rischiato di smussare un po' le punte provando ad allargare alcuni bulloni, quindi la durezza/resistenza non proprio il massimo. Probabilmente c'è di meglio nel mercato per il prezzo speso. Personalmente, per quello che devo fare, mi sta bene così. Io le utilizzo per fare qualche lavoretto a casa quindi non per un uso professionale. Spedizione e pacco ok.