Dagger Tools Extra flexible sheet metal layout edge scribe, ruler, and scale, ideal for scribing lines for panel trimming for welding and assembly, also can be used to lay on panel surface to check surfaces for high/low areas. 24” O.A.L, ¾”wide and only .020 thick with 4R scales: 8th-16th-32nd-64th graduations. Constructed from tempered steel to increase resistance to deformation. Very thin design allows excellent surface conformance no matter the contour. Long been one of our classrooms most used tools. For metal shaping, auto body panel repair and restoration, sheet metal fab, and metalworking.