Xtreme Torsion Technology helps the bit withstand high-torque fastening applications</br>High-Quality Steel, Xtreme Torsion Technology</br>Precision-Fit Tip Minimizes "Cam-Out" and Stripping</br></br>Product Description</br></br>21 Piece ultra magnetic drive bit set. It has a slide and lock bit storage case. Slides open, locks bits in case.</br><br/>http://www.amazon.com/gp/product/B00CHSVNEU