Nail guns (sometimes 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 are also used in upholstering, finishing, and other light-duty applications. Nailers have a safety mechanism that requires the tip of the tool to be compressed before the nail is fired. They 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.