Sealey Ak8189 Left Hand Spiral Drill Bit Set 5Pc

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 :)

Good solid little bits of kit did the job perfectly start small with lub and work your way up popped the bolt right out .

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

I used these to drill holes for my stud extractor and they work better then expected. Sometimes they even unthread a snapped bolt without the need for the exstractor. They also seem to be harder wearing and sharper then standard hss drill bits.

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.

used these in conjunction with extractor set worked a treat

The smaller 3 bits in this set had big folded burs on the cutting edge and the smallest bit was barely sharp as the bur just dulled the edge, had to clean up the cutting edge before use

Did the job they were intended for, seem very soft and won't stay sharp for long, but it got me out of a sticky situation, so all good

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.