Security Icon Set is a collection of attractive toolbar and menu icons for security related software.
Security icons come in all popular formats and sizes, so you'll certainly find the one suiting your needs. The icons are delivered in sizes 16x16, 24x24, 32x32, 48x48 and also 256x256 used for Windows Vista. The icons come in two color variants: 256 colors and True Color with semi-transparency. They also have several file formats, such as ICO, PNG, GIF and BMP.