In woodworking circles, the lock miter is often referred to as a “trick bit.” By a feat of geometric genius, the bit creates both halves of a mitered corner–complete with interlocking tongues and grooves–with a single router table setup. In addition to concealing end grain, the joint’s interlocking profile provides a mechanical advantage that offers an increased gluing surface and keeps parts from shifting when they’re clamped up. Lock miter bits are frequently used when making boxes, drawers, and other casework. They’re also used for larger projects, including legs and posts. Arts and Crafts furnituremakers often employ this bit to craft legs that display quartersawn grain on all four sides.