Starrett C11H-24-4R Combination Square with Cast Iron Head and Black Wrinkle Finish 1/EA Steel With reversible lock bolt, scriber, spirit level Graduation: No. 4R - 1/8", 1/16", quick reading 1/32", 1/64" Cast iron head with black wrinkle finish Square blade easy-to-read, sharp graduation Bearing surface is accurately ground Cast Iron Head with black wrinkle finish 24-Inch Starrett no glare satin chrome hardened steel machine divided blade Reversible lock bolt, spirit level and scriber Graduation is Quick Reading 32nds, 64ths. Aircraft Quick Reading 50ths, 100ths Graduation is 8ths, 16ths. Quick Reading 32nds, 64ths