GENERAL TOOLS ANGLE-IZER Protractor/Angle Finder measures and marks the degree of an angle on outside, inside, and sloped angles. It features fine black graduations from 0 degrees to 80 degrees in opposite directions and a brass lock nut for secure measurements. The #29 plastic protractor is ideal for construction jobs, cabinet-making, and fine carpentry, where a standard protractor or T-bevel won't fit.