18-400mm High-Frequency Welded 1-1/4"-7 UNC Great Wall Teeth Segment Diamond Core Drill Bit Hole Saw for Concrete Masonry Brick

1.The industry-standard 1-1/4"-7 UNC spindle mounts straight onto professional core drilling rigs — no adapter stack between the motor and the bit. Direct drive means no added runout, full torque transfer, and a bit that stays concentric under load, hole after hole.
2.Can be used for drilling in a variety of materials, including concrete, reinforced concrete, hard brick, masonry, and asphalt;
3.High-frequency welding ensures strong weld strength, effectively preventing the teeth from falling off; performance is greatly enhanced;
4.The Great Wall teeth segment profile breaks the cutting edge into controlled contact points and opens a wider channel for slurry and cuttings — the bit feeds faster through hard concrete and clears swarf instead of grinding it back under the segment, where flat-tooth barrels bog down and glaze.
5.From 18mm service runs up to 400mm structural and duct openings — one bit line covers the full range of penetrations on a commercial job: HVAC and fresh-air ducts, supply and drainage, electrical risers, and structural cores, without sourcing a second supplier mid-project.
6.Constructed with a high-quality steel body and diamond cutting tips, ensuring smooth drilling and a long service life.
7.Premium-grade core bits for long lifetime,less chipping and minimizing any breakage;