Stainless steel for, strength and rust resistance Perfect for students, machinists, carpenters and woodworking hobbyists for setting bevels, measuring and transferring angles Easier to identify the precise angle Deeply etched graduations read from 0° to 180° in forward and reverse directions and will not wear or rub off Adjustable protractor arm locks into desired position with knurled thumb nut to quickly and easily identify angles, Manufacturer: HVRFJXI