Professional quality 70-piece bit set</br>Black oxide coating to resist corrosion</br>Compatible with all quick-change connector systems, electric or battery-powered drill/drivers, and impact drivers</br>Proprietary heat treatment makes for sharper, longer-lasting life</br>Manufactured using high-speed steel with precision 135-degree split-point tips</br><br/>http://www.amazon.com/gp/product/B000UZ0VTU