The 14-in-1 Multi-Pro HVAC Screwdriver (8142) is loaded with six double-ended bits and one single-ended bit—including one Specialty Schrader Valve Stem Bit and one Square Awl Reamer Bit—to fit most HVAC applications: • Phillips: 0+3, 1+2, 2+2 • Slotted: 3+5, 4+6, 5.5+Schrader Valve Stem • Square Awl Reamer The Retractable Bit Cartridge in the handle makes storing, selecting and changing bits quick and easy while saving toolbox space and reducing the risk of lost parts. The Palm Saver Cap—the largest cap surface in the hand tools industry—remains stationary while turning the driver handle, which provides comfort, prevents blisters and enables one-handed use. The EZ-Guide Collar delivers greater control by maintaining alignment between the screwdriver and the fastener. An alloy steel shaft and engineered nylon/ABS handle make these tools nearly impossible to break. And the shaft opening also serves as a 1/4 in. hex driver.