2-Piece Klein Tools HVAC Screwdriver Tool Kit was designed for the HVAC professional. The 11-in-1 Multi-Bit Screwdriver / Nut Driver comes with a Schrader bit, 2 Phillips bits, 2 Slotted bits, 2 Square bits, and 3 Nut Driver sizes. Each of the 11 tips is blast finished to provide a firm hold and reduce cam out. It also has Klein's Cushion-Grip handle for greater torque and comfort. The 2-in-1 Nut Driver, Hex Head Slide Drive, 1-1/2-Inch has a unique, patented tip slides back and forth from 1/4-Inch and 5/16-Inch hex sizes.