- Steel drill gauge for checking fractional bit diameters
![Irwin Hanson® Rotary Carbide-Tipped Masonry Drill Bits, 5/16" X 4", #IR-61116 (5/Pkg) Irwin Hanson® Rotary Carbide-Tipped Masonry Drill Bits, 5/16" X 4", #IR-61116 (5/Pkg)](https://cdn11.bigcommerce.com/s-gdy1ehz/images/stencil/500x659/products/257835/442294/61112__67864.1665683596.jpg?c=2)
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