Black & Decker 5/16 in. x 3 in. Glass/Tile Drill Bit Model: 16903 S UPC: 028874169036
Description: The BLACK & DECKER 5/16 in. x 3 in. Glass/Tile Drill Bit is a specialty bit with a carbide tip. It fits 3/8 in. drills or larger. It is for drilling holes in glass, mirrors, tile and ceramics.
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Pros: Very versatile, durable and well built. Cons: There are a lot of pinching points on this when you open it up. BottomLine: You will not be dissatisfied with this product, plus you should never have to use the warranty.