Add detail to the crosshead with this flat urethane keystone. The keystone is designed for use with 8" and 9" crossheads with bottom trim. The back of the keystone interlocks with the moulding profile of the crosshead for a perfect fit. The keystone measures 7 23/32" in width and 9 1/2" in height, and it has a projection of 5 29/32". The keystone can be installed with adhesive. The attachable keystone is molded with precision in urethane, a high-density polymer material that is also used to craft the crosshead. The keystone is primed when molded and ready for finishing.