Why is 3.2mm a common drill bit size (when other bits are typically whole or half millimetre increments)? - Quora
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Drill America - D/ACO1INCH 1" Reduced Shank Cobalt Drill Bit with 1/2" Shank, D/ACO Series: Amazon.com: Tools & Home Improvement
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25PCS Plastic Box Packed HSS Titanium Coated Half Ground Twist Drill Bit Set - China High Speed Steel, Twist Drill Bit | Made-in-China.com
![Bosch 1/2-in x 6-in High-speed Steel Masonry Drill Bit for Hammer Drill in the Masonry Drill Bits department at Lowes.com Bosch 1/2-in x 6-in High-speed Steel Masonry Drill Bit for Hammer Drill in the Masonry Drill Bits department at Lowes.com](https://mobileimages.lowes.com/productimages/be4ddf18-28ba-490d-916b-d1d6fe80c930/05388725.jpg?size=pdhism)
Bosch 1/2-in x 6-in High-speed Steel Masonry Drill Bit for Hammer Drill in the Masonry Drill Bits department at Lowes.com
![Chicago-Latrobe - Reduced Shank Drill Bit: 5/8'' Dia, 1/2'' Shank Dia, 118 °, High Speed Steel - 00980243 - MSC Industrial Supply Chicago-Latrobe - Reduced Shank Drill Bit: 5/8'' Dia, 1/2'' Shank Dia, 118 °, High Speed Steel - 00980243 - MSC Industrial Supply](https://cdn.mscdirect.com/global/images/ProductImages/0098024-23.jpg)