"Jet 228237 21-Piece Cobalt Drill Bit Set" is what's advertised.Ordinary steel with an essentially mythical "cobalt coated" surface is what's in the box.The rainbow colored coating (rainbow is Jet's name for the garish surface staining) is meant to disguise the ordinary HSS material the bits are allegedly made of.The printing on the front of the box says "Cobalt Drill,Bits" but on the back the dark truth comes out."Cobalt-coated HSS drill bits" indeed!Examination of the bit tips suggested sloppy fabrication, being occasionally off-center.The larger sizes were at the upper end of the allowable tolerances in diameter.I have no way to test if these things are even made of ordinary high-speed steel with breaking them, but it wouldn't surprise me if they're made of melted-down Yugos. If you want cobalt drills, buy American.Firms like Irwin make their cobalt drills entirely of cobalt-alloy steel, which means that if they ever need sharpening, there is no coating to grind away.In the case of the Jet 228237, the 'J' stands for junk.I am returnibg my set without putting a single bit into my drill press. I distrust them that much!Click Here to see more reviews about: Jet 228237 21-Piece Cobalt Drill Bit Set
Product Description:
Includes: 21) Drill Bits from 1/16" to 3/8" in Increments of 1/64"Indexed Steel Case
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