Mason's mitre with much less waste than occurs with a common mitre joint, in which triangular sections must be removed from the ends of both joint members. The terms "back mitre" and "mason's mitre" (or "miter") are often used interchangeably, but are different types of joints, and used for different purposes. Both joints are traditionally used in stone or woodwork. Neither joint requires that one part be coped (or fit) over the other. In the back mitre, the joints follow the mitre and stile/rail joining lines. In the mason's mitre, the intersecting mouldings are carved within a single stone block or the
Dovetail rail Dovetail rail A dovetail rail or dovetail mount can refer to several types of brackets found on firearms primarily for mounting sights. Dovetail "rails" usually refer to any rail with a inverted trapezium (dovetail) cross-section (though the hexagonal-profiled Weaver rail and Picatinny rail are also derivative dovetail designs) running parallel to the bore for mounting a scope or diopter sight to a rifle. These are sometimes also called "tip-off" mounts, and allow the user to easily take on or off the sight. "Dovetail mount" can also refer to a dovetail track running perpendicular to the bore, see "Other uses" below.