• Best For: Coring crews who need a 2-1/4" (57mm) hole in concrete, one step up from a 2" bit.
• Highlight: The 2-1/4" (57mm) size carries the same Supreme Grade turbo segment design, with less vibration when coring through steel-reinforced concrete.
• Expert Note: The 57mm diameter sits between the 2" (51mm) bit, 158711, and the 2-1/2" (64mm) bit, 158713; size it to the pipe or conduit you are passing through the hole.