1.High Quality Material: Made Of Aluminum Alloy With Anodic Oxidation Treatment, It Is Durable And Anti-Rust. High Hardness, Anti-Rust, Non-Corrosive, Permanent Use.^2.Perfect 90 Corners: This Precise Clamping Square Is Designed To Be Attached To Boxes, Frames, Etc. To Help You Square Up While Gluing. This Right Angle Positioner Has Two Ex-Tra Notches. True Right Angle For Interior And Exterior Squares. Base And Folded For Straight Line And Parallelism.^3.How To Use: Place A Square In The Corner Of The Two Pieces You Need To Square And Secure With A Set Of Pliers. Metric And Inch Graduations. Accurate Calibration, Easy Operation, Will Not Easily Damage Fragile Cutting Edges. Available In 12 Cm, And Delivered In A Set Of Two.^4.Professional Design: Designed To Be Attached To Boxes, Photo Frames, Shelving Cabinets And For Outside Corners, Etc., To Help Square When Pasting. Beveled Edges, Easy To Handle And Will Not Damage Fragile Cutting Edges.^5.Large Application: You Will Have Exactly What You Need To Perfectly Create Boxes, Drawers, Cabinets, Picture Frames, Furniture, Etc. Some Carpenters Even Find It Useful To Integrate Them Into Their Jigs And Fixings. Satisfaction - Great Utility - Square Of Efficiency.