• Best For: Coring crews who need a 2-1/2" (64mm) hole in concrete where a 2-1/4" bit is too small.
• Highlight: The largest of the three MK-Black Turbo sizes listed here at 2-1/2" (64mm), with the same high-diamond-concentration segment design that channels slurry.
• Expert Note: Next size up from the 2-1/4" bit (158712); choose 64mm when 57mm leaves too little clearance for whatever passes through the hole.
