Square Head Compatible with Manufacturer Model Number 11H-12-4R 11HC-12-4R C11H-12-4R Compatible with Grainger Part Number 26Y957 2ZUR1 3AEP9 Head Type Square Finish Wrinkle Material Cast Iron Steel Compatible Blade Length 12 in Compatible Square Type Bevel Protractor Combination Set Combination Squares Product Type Head Color Black Compatible Blade Width 1 in Overall Length 4 in Overall Width 1 in