The General Tools Multi-Pro Screwdrivers offer a retractable bit cartridge in the handle. The 15-in-1 Multi-Pro Standard Driver, No. 8140, is loaded with seven double-ended professional quality bits, providing the 14 most popular standard bits. The 15-in-1 Multi-Pro Tamperproof Driver, No. 8141, contains seven double-ended tamperproof bits, including the most popular security bits. The 14-in-1 Multi-Pro HVAC Screwdriver, No. 8142, features six double-ended bits and one single-ended bit to fit most HVAC applications. All screwdrivers include the Palm Saver Cap, the EZ-Guide Collar, an alloy steel shaft and an engineered nylon/ABS handle. The shaft opening also serves as a 1/4" hex driver.