Description High-quality material: Made of anodized aluminum alloy for high durability and rust resistance. High hardness, rust and corrosion resistance, for long-lasting use. Perfect 90 Angles: This precision clamping square is designed for clamping boxes, frames, etc., allowing you to maintain right angles during gluing. It has two additional grooves, allowing you to obtain right angles at both interior and exterior corners. The base and folding part ensure straightness and parallelism. Instructions: Place the square at the corners of the two parts to be adjusted and secure it with the clamp. The ruler has metric and imperial scales. The precise scale makes it easy to use without damaging delicate cutting edges. The ruler measures 12 cm. Professional Design: Designed for gluing onto boxes, frames, shelves, and outside corners, it helps maintain a right angle while gluing. The beveled edge makes it easy to use without damaging delicate cutting edges. Versatile: You'll have everything you need to perfectly create boxes, drawers, cabinets, frames, furniture, and more. Some woodworkers even find they can be integrated into their jigs and fixtures. Satisfaction - Practicality - Increased Efficiency