Premium Material: Made of sturdy aluminum alloy after oxidation treatment, this saddle ruler set is durable, distortion-proof, practical, rust-proof and corrosion-resistant. Surface: Laser etched metric graduations and angles on each side of the miter t-rulers are clear and precise, making them convenient and easy to read or mark when using. Slide to mark: There is no need to invert the body when measuring, just slide to mark the right and left angle of 45/90 degrees. Top Precision: The square protractor helps you draw perfect horizontal lines while sliding the ruler along the edge of your work. Measuring, correcting, marking in one product. Application: thick ruler, make the ruler stable and accurate, perfect for DIY, engineer, carpentry, woodworking and home use.