• Best For: Contractors coring 6-1/2-inch (165mm) holes in concrete slabs, walls and asphalt with a wet rig.
• Highlight: The 156337 is the 165mm size, a quarter inch above the 6-1/4-inch 156336 and a half inch below the 7-inch 156338.
• Expert Note: A 6-1/2-inch core removes about 10.6 times the material of a 2-inch core per inch of depth; plan the water supply for the full depth before starting.