High Quality Material: This 90 degree angle clamp is made of high quality aluminum alloy with rust and corrosion resistant surface, with metric and imperial scale, durable for long term use. Accurate Scale: This angle clamp is available in metric and imperial measurement units. Laser engraving and graduation on the front of the product (two sides). The length measurement is accurate and easy to read, making it ideal for woodworking. Professional Tool: Practical use and feedback from woodworking professionals have shown that this size (140mm) is a very scientific and appropriate choice of the size of the angle clamp. There are 8 holes in each set of fasteners for easy installation. Design Details: The Right Angle Clamps have slightly chamfered edges and a smooth, soft surface that won't scratch your hands or woodwork. Simply place the positioning square on the corner of the wood piece and secure it with a set of clamps to form an exact 90-degree angle. Wide Applications: This 14cm