Door Guard & Surface Bolt Collection General Purpose Surface Bolt - 3 Inch Add security to your entrance way without sacrificing style by installing one of Baldwin's general purpose surface bolts. Crafted from solid extruded brass and mounted on a specially designed fully concealed guide, you get all the strength of a solid brass surface bolt without visible fasteners, maintaining a high quality look to match your entrance decor. Each of these general purpose surface bolts is evidence of Baldwin's heightened dedication to quality and style. Baldwin knows that peace of mind is important, and with quality door security, it's that much easier to achieve.