On Mon, 21 Aug 2006 13:30:27 -0400, "HotRod"
wrote:

the slabs are 4" think. What works better a hammer drill and masonary bit or
a diamond dry bit in a regular drill?

Neither. A rotodrill sounds much faster and better, according to a
thread yesterday. You can rent one.


"HotRod" wrote in message
...
I'm working on a retianing wall project that involves using busted up old
concrete slabs. I need to drill a ton of 3/4" - 1" holes as the blocks get
higher, any ideas? Also ideas on how to crack the 4" thick concrete where
I need to? Do you think a peice of angle iron and a sledge is best?