The Big Horn 19562 8 Inch Mortise & Marking Gauge is a versatile marking tool to create mortises, joints, and a wide range of other woodworking applications. This versatile tool is equipped with dual-adjustable hardened pins on one side for marking both sides of a mortise while the reverse side has a single pin to be used as a standard marking gauge. These finely honed-steel marking pins create precise markings on wood to ensure clean and accurate cuts. Brass thumbscrew locking mechanism to easily adjust the marking and mortised depth. Constructed from polished hardwood and equipped with brass contact points for durability and as well as wear and tear resistance.