Die-cast. This unique product is the most versatile locking unit available. It will accommodate 7 different hole spacing patterns (see illustration). The 3-15/16" hole spacing is designed for use with mortise lock installations using Adams Rite and W&F mortise locks. These holes are offset 1/8" from that of the locking cylinder hole. The spacings allow application to a variety of handle sets. 1 outside pull, 1 locking cylinder, and installation fasteners. Black.