Cordless nail guns (also called nailers) drive nails and pins quickly, accurately, and with less effort than manual hammers and staplers. They hold nail strips or coils that feed nails one after the other to speed installation in framing, roofing, cabinetry, and flooring tasks. They're also used in upholstering, finishing, and other light-duty tasks. A safety mechanism requires the tip of the gun to be compressed before the nail fires. Guns accept nails with a compatible collation angle, collation type (e.g., glue, paper), head shape, gauge or diameter, length, and style (e.g., finishing, brad). Nailers using straight-collation nails drive nails square while nailers using angled-collation nails drive nails at angles and in corners. Cordless guns run on batteries, so they are more portable than air guns and allow use where a compressed air supply is unavailable. Brand-specific batteries can be used with various cordless tools of the same brand/manufacturer that have the same battery series and voltage.