14.4 Cordless Drill
The 14.4 volt cordless drill might be the most popular size consumers purchase. They can have great power, but not weigh too much. My favorite is the Bosch Brute Tough model 37614. It's a beauty of a tool with plenty of power. The keyless chuck and adjustable clutch makes it great for many jobs. You can use it as a screwdriver on steroids!
Tim built custom homes and did ultra-custom remodeling for 20+ years before launching his Ask the Builder media presence. He was selected as one of the Big 50 by Remodeling magazine in 1993. This award gave birth to Ask the Builder in October 1993. Tim also operates https://DrawPlumbingPlans.com. His @askthebuilder YouTube channel was the first home improvement channel on YouTube.