I first because very impressed with cobalt bits after drilling a ton of holes in 1/4 red iron with dewalt bits and the bosch just don't last nearly as long. without a pilot hole the bits above 3/16" wear out much faster than the dewalts. It's the nicest case for drill bits i've ever had though so it gets' three stars, when one brakes or wears out, i just replace it with a dewalt...Click Here to see more reviews about: Bosch CO18 18-Piece Cobalt Twist Drill Bit Assortment in Plastic Case
Product Description:
These Bosch cobalt drill bits offer superior heat resistance, plus a rigid thick web design for drilling in extremely hard or abrasive materials such as treated stainless steel (precipitation-hardened), cast iron and titanium.
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