CRL 3-1/2" HBT Series Belgian Thread Electro-Formed Diamond Drill Caulks & Accessories or you can order it

or you can order it separately

this is the glass cleaner you want to use

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CRL revolutionizes onsite drilling with tomorrow's technology

CRL 3-1/2" HBT Series Belgian Thread Electro-Formed Diamond Drill Caulks & Accessories or you can order itFor Fast Cutting, High Production Runs Extended Work Life Two Mounting Styles to Choose from Straight Shank or Belgian Type These CRL Electro Formed Diamond Drills are thin walled, with a 1 2" (12. 7 mm) deep multi layer of diamonds and bonding matrix designed for high speed, high production drilling. These drills give outstanding results when exacting conditions are met. The CRL DCD Series features an extra long 1 3 8" by 3 8" (35 by 9. 5 mm)