"I bought these a few years ago. I'm an agricultural fencing contractor. Use them in a chainsaw power head drill. Under 10 seconds through a 9inch post. But you do need a good power unit with plenty of torque to keep it going. Never sharpened any bits yet and. The 13mm has done over 400 25cm depth holes on one job. I seriously bent it, straightened it and it runs as good as ever. Also hit a nail with it. At the price it's feasible to buy another replacement set if you use them plenty."
"Great performance - eats wood with ease - have not had them long enough to give a higher rating on reliability - but based on performance so far I would not expect unreliability - also - as an added extra - they come with a really sturdy zipped case - would definitely recommend..."
"Excellent quality from erbauer in a case that's almost too nice just for drill bits.
They do however require a pretty powerful drill to pull through the wood as my smaller drill won't even entertain them. Large drive size also so check before buying your drill will cope with them. Very good set though."
"Excellent value for money, do the job very well, wear rate is also good, even with intensive use they stay sharp longer than other augers of this type. Now on our standard supplies list. If you need holes this size these are the ones to do it."