Aluminum Alloy Material:This Triangle Ruler is Made of sturdy aluminum alloy after oxidation treatment, this woodworking triangle ruler is durable, resistant to distortion, practical, anti-rust and corrosion resistant. Precise Measurement:Laser engraved imperial and metric scales on the front and side of this angle ruler are clear and precise, making it convenient and easy to read value or make marks while using. Dimension:2.67 x 2.67 x 3.74, lightweight and portable, easy to carry or store; square with 0.6 thickness allows it to stand up by itself, using for measuring the length, height and thickness. Easy To Use:The large center hole design would fit for your finger to hold or fasten this ruler on workpieces, easy and comfortable to place, handle or move around and won't damage fragile cutting edges. Application:This 45 degree aluminum alloy angle ruler is designed to clamp boxes, photo frames, etc, to assist with square making process; an essential tool for woodworking lovers, home builders, carpenters, engineers, and hobbyists.