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. Slotted Bits 1/8" (3.2 mm), 1/4" (6.4 mm) Overall Length 7.5" (19.1 cm)Application HVAC Overall Height 1.25" (3.2 cm) Magnetic Yes Nut Driver Sizes 1/4" Magnetic, 5/16" Magnetic, 1/4", 3/8" Special Features Slide Drive Phillips Bits #2 Overall Width 1.25" (3.2 cm) Handle Length 4.313" (11 cm) Weight 8 oz (227 g) Handle Type Cushion-Grip Handle Color Yellow/Black Shank Length 3.25" (8.3 cm) Other Bits Schrader Valve Core Removal Style_Name Screwdriver/Nut Driver