My hollow core nut drivers! So useful almost everywhere around the shop, truck and home. I love them. Second favourite are my ratcheting box end wrenches. The ratcheting ends are bigger than non-ratcheting ones but still like them. And finally and I guess it could be considered a hand tool is my cordless drill. Never thought to buy one but HD had a half price sale one Sunday morning about 10 years ago so I bought the set. How did I ever live without one! Built the bunny barn with 5 inch screws in the rafters and walls and just finished a small deck. Had to buy another battery though. And you can but socket adapters so its better yet. No more dragging an extension cord around.
