FEATURES  Reversible lock bolts, scriber, spirit level in both square head and protractor head  Direct reading double 180 Deg protractor scale  Direct reading double 180 Deg protractor scale  Non-reversable protractor head  Hardened steel, machine divided blade  Regular Finish Blade  Cast Iron Heads with Black Wrinkle Finish  SPECIFICATIONS  Made in America: Yes  Blade Length (in): 23-1/2"  Blade Length (mm): 600mm  Blade Finish: Regular  Graduation Type: 36  Graduations: 1/2mm and 32nds One Side; mm and 64ths Reverse Side  Head Finish: Black Wrinkle  Head Material: Cast Iron  Head Types: Square, Center, Protractor  Number of Pieces: 4  Protractor Type: Non-reversible