This stainless steel protractor is a highly useful and accurate tool for marking, measuring, and transferring angles.  It can read both inside and outside angles, making it handy for framing and many other small squaring tasks.  Perfect for students, architects, machinists, carpenters, woodworking hobbyists and more. Johnson’s 6” stainless steel protractor is an essential tool for students, architects, machinists, carpenters, and woodworking hobbyists for accurately marking, measuring, and transferring angles. Constructed of durable stainless steel with permanently etched, highly visible measuring scales. The protractor head has a 0° to 180° semi-circle scale reading in both directions for maximum versatility. Use the 45°, 90° and 135° reference markings for quick and precise mitre angles.