The keystone enriches entryways and windows with prominent detail. We offer decorative keystones designed for use with crossheads. An interlocking design provides for easy installation with the crosshead. This keystone features a recessed panel. The keystone is molded with fine detail and durable. The recessed keystone is crafted in urethane. Urethane molds with the precision and detail that makes it a modern favorite. Like the urethane crosshead, the urethane keystone performs exceptionally well in exterior applications, as it is non-porous and highly resistant to the effects of moisture. The keystone is also pre-primed.