High Quality: The 7 Inch and 12 Inch triangles are made of aluminum alloy, which is lightweight, convenient, corrosion-resistant, unbreakable, durable and hard. Each edge of the triangle ruler is polished by special craftsmanship, smooth and does not hurt your hands. Accurate Scale: The woodworking square scale is calibrated by professionals before production, clearly visible and easy to read. The woodworking square scale is deeply engraved, readable and can be used for a long time. The rafter square uses both metric and imperial units, which can effectively improve work efficiency. Easy to Use: Triangle ruler set with 7 Inch and 12 Inch woodworking carpenter rulers. accurate 45and 90angles for quick measurements. The rulers have holes of different diameters, easy to draw and measure the size of the holes, as well as quick drilling. Base snaps to the edge of the object for easy measuring and drawing. Wide Occasion: As a construction tool, it is suitable for wood projects and carpentry, but also for hobbyists, home builders, manufacturers and artists, as well as for painting, drawing, surveying and more. After Sales Service: Dajianglx values every customer response and offer friendly customer service. In any case you are unsatisfied with the purchase of our product. We are willing to help you in every possible way. We sincerely hope you could enjoy the purchase .