Shinwa Sokutei 62839 Protractor Diameter 8.3 Inches (210 Mm), 2 Poles, 11.8 Inches (30 Cm) Scale Included, No.300, Silver

The scales are etched and black chrome plated so they won't come off. Silver treatment reduces reflections on the surface and makes it easy to read. Protractor Plate: Diameter: 8.3 inches (210 mm), Thickness: 0.08 inches (2.0 mm), Scale Pitch: 0.5 degrees Rod: Number of Pieces: 2 pieces, Length 15.2 inches (385 mm), Scale 11.8 inches (300 mm) Uses: Angle measurement and injury prevention and length measurement Packing Size: 8.7 x 15.4 x 2.0 inches (22.0 x 39.0 x 5.0 cm)