4-1/8 inch Diamond Core Drill Bit, 10" Drilling Depth.
This is about 1 month old. It was used with a handheld drill to make a hole through concrete for a dryer vent and to make a hole through tile for a shower control valve. It can be used wet or dry. It has a pilot bit to guide it, similar to a hole saw. It includes a standard hex shank, SDS Max impact head and SDS Plus adapters, two pilot drill bits and tools.