Klein Tools 600-4

After fifteen years in HVAC, I’ve learned that your screwdriver takes more abuse than almost any other tool in your bag. The Klein Tools 600-4 has been my daily driver for the past three years, and it’s still going strong. What sets this apart isn’t flashy—it’s the basics done right. The cushion grip actually stays put when your hands are sweaty or greasy, which matters when you’re cramped behind a furnace in July. The 1/4-inch tip fits most terminal screws perfectly without slipping, and being Made in USA means quality control you can feel. I’ve stripped countless terminal blocks, reset dozens of contactors, and this thing hasn’t let me down yet. It’s not the cheapest option out there, but when a reliable screwdriver saves you even one callback, it’s paid for itself.