Rafter Square Scribe Notch End 12 cm Scribe Notch Start 2 cm Includes Not Applicable Center-to-Edge Heel Width 8 3/4 mm Scribe Notch Graduation Marks 1/2 cm Scribe Notch Location Top Square Size 18 cm Square Material Aluminum Graduation Mark Style Etched Graduation Marks - Base 5 mm Graduation Marks - Blade Not Applicable Specialized Scales Degree Scale System of Measurement Metric Square Type Rafter Coating Anodized Edge Style Square