This is the Keep-Nut 5/8 inch -11 Non-Coring Drill bit w/ Stop Collar for Manual Polisher/Grinders and it's just what you need for drilling your stones. This 5/8 inch-11 non-coring drill bit for drilling holes in natural and engineered stone for the Keep-nut anchoring system. Comes with stop collar to set repeatable depths. Use on a manual stone polisher with water attachment. 3500-4000 RPM recommended.
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