ALPHA CORE BIT EXTENDERS
Alpha® now offers a Core Bit Extender, which allows you to drill hollow concrete blocks from one side for both walls. The Extender can be used on hammer drills and rotary hammers.
The Extender, with 5/8”-11 female thread, is available with an SDS Plus or ½” Hex Shank and comes in lengths of 6” or 10”. A pilot carbide drill bit guides to the right spot without slipping on the surface.