It shouldn't matter what brand of drill bit you buy but here's stuff I
learned about masonry bits, etc.
The size of the bit IS important depending on your drill... if the bit is
1/2 inch in diameter and your bit only will open to 1/4 inch your drill
won't take it. Are your chucks keyless (do you tighten them by hilding the
chuck and running the drill?) if so, round bits become loose much more
easily than bits made for this kind of chuck. They have octagonal shafts.
cinder block is more difficult to drill into because of the composition.
anyone who has tried to drill into old block and hit a stone will agree with
this. back the bit out frequently to get rid of the concrete silt which
will slow you down if it builds up. also if you it a spot that stop you
dead no matter how hard you push, take the bit out of the hole and use a
center punch or long skinny chisle with a hammer to try and break through
slightly being careful not to damage the block. The resume drilling. If
this doesn't work you might need to find another location to drill. Hope
this helps.
phil