Rafter Square Scribe Notch End 9 in Scribe Notch Start 1 1/2 in Includes Not Applicable Center-to-Edge Heel Width 1/2 in Scribe Notch Graduation Marks 1/4 in Scribe Notch Location Top Square Size 12 in Square Material Aluminum Graduation Mark Style Etched Graduation Marks - Base 1/8 in Graduation Marks - Blade Not Applicable Specialized Scales Degree Scale System of Measurement SAE Square Type Rafter Coating Anodized Edge Style Square