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Type 28 shape allows greater surface grinding coverage
Safety valve prevents gas flow when tip is removed
Three-flatted shank design provides better chuck grip and reduces slippage
PlumbSite™ vial for easy reading
Hole in flute for easy wire pulling through walls
DeWalt DD4321B12 #21 Cobalt Screw Machine Drill Bits 12Pcs. Germany new Type 28 shape allows greaterDeWalt DD4321B12 #21 Cobalt Screw Machine Drill Bits 12Pcs. Germany Patented web taper is 2X larger than the competition for increased strength, rigidity and breakage resistance Optimized 135 degree split point gives exceptional service life and also allows the bit to start on contact Heavy duty flute design produces maximum durability Increased cobalt content provides exceptional wear resistance and longer life If you have a question about one of our
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