The classic style "S" Shutterdogs add a decorative flourish to your older home, or some vintage charm to your newer home. These steel shutterdogs come with a flat black finish and measure 8-1/8" tall. These are sold as a pair and come with the lag bolts for mounting. Each design is a careful reproduction of an antique design with excellent detail. In engineering, a dog is a tool or part of a tool that prevents movement or imparts movement by offering physical obstruction or engagement of some kind. It may hold another object in place by blocking it, clamping it, or otherwise obstructing its movement. So a "Shutter Dog" is a stay that holds a shutter in place. These are traditionally used on the exterior of a house to hold a shutter open. They are historically found in a variety of shapes including grapes, shells, "S" shapes, and "rat-tails" among others.