This 8-in-1 HVAC Slide Drive Screwdriver / Nut Driver has a unique, patented head that slides back and forth to switch from 1/4-Inch to 5/16-Inch magnetic hex-head screwdriver. Convenient thumb nut locks tip setting. It includes a specialty bit for the installation/removal of common TR-4 Schrader valves as well as regular 1/4-Inch and 3/8-Inch nut drivers plus Phillips/slotted double-ended bits. Offers the HVAC tech the convenience of having magnetic nut drivers on a multi-bit screwdriver. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.