Amazon.com has a Drill Doctor DD750PK Precision Drill Bit Sharpener for $69.99 after $30 in rebates with Free Shipping.

• Sharpens conventional point, split point, and masonry drill bit at 118- or 135-degree angles
• Two chucks accept 3/32- to 1/2-inch and 1/2- to 3/4-inch bit shafts
• Long-lasting Diamond wheel sharpens carbide, high-speed steel, standard, cobalt, and more
• Comes with how-to video

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