Starrett 11H-12-4R Combination Square with Cast Iron Head and Black Wrinkle Finish 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 12-inch hardened steel, machine divided blade Reversible lock bolt, scriber, and spirit level Graduation is 8ths, 16ths--quick reading 32nds, 64ths The value of Starrett Tools is that they are accurate and will last