Why do these bits have different markings on them, hss, hsco, and co?

Hello, HSSCO and CO are both cobalt drils. There should not be any HSS only drills in there. If there is any drills marked only HSS please contact us on our website at www.DrillAmerica.net with your order information we will get it straightened out for you. Thank you.

what is the difference between the 35 and 42? i dont see a difference in the specs

The 42 has a higher cobalt content than the 35.

Are thesse bits good for dripping in t7075 aluminum?

Hello, Yes, you can use these cobalt drill bits on this aluminum material.

how do i replace broken bits? I have the M42 set and need to replace 1/8 and 7/64 bits

these bits come only in this set. i bought many different single bits on amazon. put in 1/8 drill bit on amazon or any size and you will find many choices.

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🔧 Elevate Your Drilling Game with Style!

ERGONOMIC DESIGN - Easily grip and carry the round case, perfect for on-the-go professionals.
EXTENDED TOOL LIFE - Cobalt construction ensures durability and longevity, outperforming standard high-speed steel.
FUNCTIONAL AESTHETICS - Stylish and practical, this drill index is designed to impress while delivering top performance.
UNMATCHED VERSATILITY - Drill through tough materials like stainless steel and titanium with ease.
HIGH SPEED PERFORMANCE - Achieve speeds up to 30% faster than conventional bits, thanks to aerospace-grade manufacturing.

The Drill America D/A29J-CO-PC 29 Piece M42 Cobalt Drill Bit Set is a premium collection designed for professionals who demand precision and durability. With sizes ranging from 1/16" to 1/2" in 1/64" increments, these cobalt drill bits are engineered to tackle tough materials like stainless steel and titanium. The gold oxide finish enhances performance and wear resistance, while the round shank design ensures compatibility with various tool holding systems. Manufactured to Aerospace Standard 907, this set not only meets but exceeds expectations in high-speed drilling applications.

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