A brad nailer is a power tool that drives small nails, also known as brads, into wood or other materials. It is similar in appearance to a finish nailer, but the nails used are smaller in size. Brad nailers are available in both pneumatic and battery-powered versions. The nails used in a brad nailer are typically 18-gauge, although some models use 21-gauge nails. Brad nailers are ideal for small trimming and molding jobs where a larger nail might split the wood. The holes left by brad nails are small and do not require filling, which saves time. When choosing between a brad nailer and a finish nailer, it is important to consider the size of nails needed for the project and how deep they need to go.