The Groz Standard Screwdriver with retracting cartridge has a patented retractable bit cartridge, making it easy to find, store and change 7 double-ended bits. These bits are made from Industrial Grade S2 modified steel with a Rockwell hardness 58-62. The screwdriver handle is made from specially engineered ABS resin, making it durable while protecting the magnetic bit holder that has an easy guide collar.