Three sizes available It's 10 inches, 15 inches or 20 inches. The head can be adjusted from 0 to 70, and it is firmly locked every 5 (plus 22-1/2 and 67-1/2) to provide you with accurate readings and gauge lengths respectively. Clearly identifiable scale The chevron square has permanent deep markings and white graduations for maximum readability in any lighting. The combination square's stainless steel ruler has a deep etching scale for superior readability and long lasting use. Excellent Quality Our carpenter's edge ruler is made of high quality stainless steel and marked with precise angles. It has good durability and wear resistance, is not easy to rust, and can be used for a long time. The scale numbers are laser-engraved by special technology. It will disappear due to usage time and will still be displayed on your side ruler. Easy to Use The new woodworking edge rulers make your life easier by wrapping the edge of inventory and providing precise proportions of two sides. The secret to the T-shaped square is a series of precision-machined indexing holes and spring-loaded precision locating pins nearby. The pin snaps in, giving you confidence that it is positioned accurately. Widely used Multi-angle measuring ruler Suitable for all kinds of work, woodworking, flooring, tiling, fitting glass, etc. Easily occupy and duplicate intricate shapes on wood, recreating shapes on stones, wood, tiles and glass. It is the ideal angle measuring instrument for laying wood and tiles. The multi-angle measuring ruler template tool is an essential tool for anyone