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