DaduoRi 2-3/4" Dry Core Drill Bits with Pilot Bit & 3 Adapters (SDS Plus/SDS Max/1/2 Hex),Upgraded-Welded Core Bit for Concrete, Masonry, Brick, Stone, Mortar - 5/8"-11 Thread, 9.5" Depth (71mm)

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Complete Core Drill Set – Includes the dry core drill bit (OD:2.75 inch), 1 pilot bit, 1 drift key and 3 adapters (5/8"-11 male thread to SDS Max/Plus & 1/2" Hex) for compatibility. (For best results, use included adapters with guiding bit—compatibility with other brands may vary. See the user manual) Precision Design & Instant Positioning - No need pre-drilling guide bit by DaduoRi designed, enabling seamless start-to-finish operation without mode switching. Improved Cutting Diamond Segment – Features a newly cutting segment with higher durability, this 2 3/4 core drill bit with pilot bit effectively drills through low to medium-reinforced concrete. (On 8" thick concrete with 12mm rebar— 8-10 holes per bit.) Compatible Materials: This 2-3/4 in concrete core drill bit drills efficiently through brick, mortar, cinder block, and low to medium-reinforced concrete with rebar, making it suitable for HVAC, plumbing work DaduoRi's coring bits alaways design to simplify drilling tasks for both professionals and DIYers