b's R quaRes and ulesCOMBINATION Squares11H, 11HCCAST IRON HEADSCombination square with square head includes a reversible lock bolt, scriber, spirit level (except 4"), and hardened steel, photo-engraved blade with regular or satin chrome finish. These combination squares include a cast iron head with black wrinkle finish.F EaturEs Reversible lock bolt, scriber, spirit level (except 4") Hardened steel, photo-engraved blade Cast iron heads with black wrinkle finishCat. No. EDP Size Graduation Blade11H-4-4R50049 4" Regular C11H-4-4R56360 4" 4R8ths, 16ths, Quick Reading 32nds, 64ths Satin Chrome11H-6-4R50051 6" Regular C11H-6-4R56362 6" Satin Chrome C11H-6-16R 56364 6" 16RQuickReading32nds,64ths,AircraftQuickSatin Chrome Reading 50ths, 100ths11H-12-4R 50055 12" Regular C11H-12-4R 56366 12" 4R8ths, 16ths, Quick Reading 32nds, 64ths Satin Chrome C11HC-12-4R 56367 12" Satin Chrome - Center HeadC11H-12-16R 56368 12" 16RQuickReading32nds,64ths,AircraftQuickSatin Chrome Reading 50ths, 100thsC11HC-12-4R68'