[ACCURATE ANGLES] - Our protractor scales are precise, clear, and easy to read. The number on the protractor is engraved with the exquisite workmanship, never fade. [HIGH QUALITY MATERIAL] - This angle protractor is made of high quality aluminum, sturdy and durable, it is resistant to corrosion, for long term use. [EASY TO USE] - Adjustable screw design is very convenient. You can turn the ruler and tighten the screws to better measure scale, really easy to use. [180 DEGREE ANGLES] - The angle ruler is designed with a semi-circular protractor to measure oblique angle, and bi-directional scales help to measure angles precisely. [WIDE APPLICATION] - Suitable for DIY crafts, student drawing, architectural design, carpenters and woodworking industry enthusiasts, etc. Description: - Compact size, fine workmanship, easy to use and provides long lasting time. - Precise scale design, engraving, wear-resistant and not easy to lose. - High-precision angle allows you to measure more accurately and create perfect crafts. - T-slot design, more suitable for mini table-saw . - 180 adjustable, offers high precision mitered neck for extra precise control. Specification: Ruler Length: 90mm / 3.54inch; T-slot Size: 180x10mm / 7.08x3.93inch Package Includes: 1 piece Angle Ruler Note: Please submit 1- 3mm ty of measurement due to manual measurement. Due to different monitor and effect, the actual item's color may be slightly from the color showed on the pictures. Note: the data is manual measurement, please allow 1-113cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail .