General description This 300mm Metal Marking Ruler Carpenter's Square is a durable and versatile tool designed for accurate marking and positioning in various DIY and carpentry projects. It features a double-sided metric laser scale that ensures precision up to 0.5mm, making it easy to read and use for both professionals and hobbyists. Technical specifications Length: 300mm Accuracy: 0.5mm Usage Ideal for marking 45° and 90° angles. Equipped with a centimeter measurement function, featuring a small hole every 1cm for easy horizontal line operation. Suitable for a wide range of applications including carpentry, DIY projects, and crafts. Other information Includes a hanging hole for easy storage and accessibility.