"bought this as id left my core bits 150 miles away from the job. i didn't use on hammer as instructions said as i only had my battery drill (mains drill with core bits) it cut through chorley brick then block on two batteries, which i thought was pretty good. the cutter sizes are not matched to pipe sizes but then so what? the hole sizes give room around the pipe for sealing and insulting, better too slack than too tight. the bits all fit well and the release bar is a good addition. the only thing missing is an adaptor for normal drill instead of sds."
"This would probably be an excellent product for plumbers, except the core drill bits are of no use whatsoever for drilling the right size holes. Let me see, 30mm core drill, that won't fit a 32mm waste pipe through it will it??
But wait, the 50mm bit, that'll do the job and leave a massive hole round the pipe, and a 40mm pipe too come to think of it.
Sadly it won't give you any room to wiggle a 50mm pipe through.