Milwaukee Bit Extension Core Drills
All sizes have a 5/8″-11 thread. This is a good option for concrete block walls but will not perform well in poured concrete. It is also harder to remove the cut out material from the bit and possibly over-drills into material you don’t want to hit.
ToolSelect.com takes a look at the Milwaukee Max-Lok Carbide Extension System that is released in June of 2012.Milwaukee Max Lok Sds Plus 29.5 Inch Extension 48 20 – Milwaukee Masonry Bit Extension Core
We will take a very quick look at the different types of core drills and core bits available. Also, they are relatively shallow with only about 2” of drilling depth. These bits again work terrific in block walls and while it is very tempting to use them in solid concrete as well, they are really not intended for that kind of use.
Milwaukee® 48 17 4020 Premium Grade Wet Core Bit Extension
When the cutter bottoms out, pop a small bit or chisel in, switch to hammer only, and bust off the stub. But a grinder rotates roughly 10x faster than a drill. I know that the same principle applies with rotary hammers, the larger ones hit with more force, with with lower rpm, and fewer blows per minute.
You need the tool to have enough power for managing concrete, but too high a speed will kill the blade.
Bosch Sds Plus Vs Sds Max Bits And Accessories