Question: what is the difference between a 1/4 inch drill and a 1/2 inch drill?
Answer: Drills are available in 1/4-inch, 3/8-inch and 1/2-inch sizes. The measurement refers to the size of the drill chuck — the part that holds the bit — and indicates the maximum-diameter bit shank that fits the drill. A 1/4-inch chuck is sufficient for a light-duty driver. ... A 1/2-inch drill handles heavier applications.