Zenit ZD-A 9013 (843857)

"The Milwaukee Red Helix Cobalt 7/16"" Drill Bit are engineered for extreme durability and longer life in hard metal applications. The Milwaukee Cobalt drill bits are designed with a Variable Helix th more→at includes an aggressive 35 degrees Helix Angle which ends at 15 degrees. The 135 degrees split point tip delivers a precision start and prevents walking for fast, accurate holes in hard metals, PVC and wood. The tapered drill bits feature a new enhanced tapered web that strengthens the bit's core to increase flute durability. The cobalt twist drill bits are ideal for tough applications, providing up to 15X life vs. black oxide brill bits."

Specialty Bit Set (75 Pieces) by Performance Tool. If you’re looking for a reliable solution to complete your project, this 1st-grade product is right up your alley. Designed utilizing the finest mate more→rials, it delivers unmatched levels of durability and strength needed to provide long-lasting service life. Superior in functionality, it will help you make any job easier and faster.

Diablo's hi-performance screw driving set delivers extreme durability and longer life in the installation and removal of fasteners. The included drive bits have an optimized tip design to provide a st more→rong, precise grip that reduces wear, stripping and slippage. The magnetic nut setters and drive bit holder are designed with a high-strength, permanent magnet for a secure, anti-wobble grip when fastening screws and nuts. Torque resistant Design absorbs torque for less stress at the tip. This set is Impact Strong, delivering increased shank stability and durability in cordless and corded impact and drill drivers.