Design Line NotchesDesign line notches are found in our new steel precision woodworking grid. There are notches every sixteen inches throughout the blade. Simply place the pencil in the notch and slide the tip along the edge of the refill for perfectly parallel lines. Unmatched Accuracy: Our latest precision scales can provide unmatched accuracy for your panel layout work. Just press the head to the desired angle and press straight. Three Sizes Available: 10", 15" or 20". Both edges of the blade are engraved with inch graduations in 1/32" increments. The scale has a total cumulative error of 0.004" over the blade length. The thin satin steel blade is easy to read and minimizes parallax errors. Unparalleled precision: Our latest precision scale can provide unparalleled precision for your panel layout work. The Steel T-rule is made of good quality Steel, durable and sturdy;A good measuring tool, easy and convenient to use. T-Type Woodworkers Edge Rule Protractor 70 Degree Round Head Rotary 1mm Measurement Accuracy Scriber Gauge Layout Tools Angle Measuring Marking for Woodworking Carpenter Specification: Material: metal Color: silver Size: 10 inches, 15 inches, 20 inches Measuring range: 0-70 degrees Measurement accuracy: 1mm Type: Angle ruler Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement T-Type Woodworkers Edge Rule Protractor 70 Degree Round Head Rotary 1mm Measurement Accuracy Scriber Gauge Layout Tools Angle Measuring Marking for Woodworking Carpenter Specification: Material: metal Color: silver Size: 10 inches, 15 inches, 20 inches Measuring range: 0-70 degrees Measurement accuracy: 1mm Type: Angle ruler Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement