One of the pilot bits (the sets seem to come with two) either the HSS or the Cobalt one(?) had some bad reviews on Screwfix for being ever so snappy. I snapped one first time out and had it replaced by Bosch as I informed them it wasn't fit for purpose. The other bit is fine and has been since.
They refuse to acknowledge there is a problem with them. Here's a couple of the reviews I sent to Bosch.
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Rubbish!
19 Oct 2011
By AckroydPlumbingandHeating
, Sussex
" Always breaks i have gone through 6 or 7 in the last 2 years ! I like the bosch powerchange for cutting holes in ceilings for downlights etc it is a good piece of kit but the powerchange pilot drill is so brittle and is the weak link. "
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Good, not brilliant
31 Mar 2010
By Woodman2
, Horsham
" I snapped two of these drills making pilot holes in 3mm mild steel sheet. On breaking through to the other side, the flutes snatched and the bit broke halfway up the shank.
I will buy this product again, but only because I have no choice as it's specific to the PowerChange arbor. "
They refuse to acknowledge there is a problem with them. Here's a couple of the reviews I sent to Bosch.
-------------------
Rubbish!
19 Oct 2011
By AckroydPlumbingandHeating
, Sussex
" Always breaks i have gone through 6 or 7 in the last 2 years ! I like the bosch powerchange for cutting holes in ceilings for downlights etc it is a good piece of kit but the powerchange pilot drill is so brittle and is the weak link. "
-------------------
Good, not brilliant
31 Mar 2010
By Woodman2
, Horsham
" I snapped two of these drills making pilot holes in 3mm mild steel sheet. On breaking through to the other side, the flutes snatched and the bit broke halfway up the shank.
I will buy this product again, but only because I have no choice as it's specific to the PowerChange arbor. "