The Workpro 300mm Combination Square is a precision multi-function measuring tool designed for professionals and serious DIY enthusiasts. Its stainless steel ruler and zinc alloy head provide a durable, rust-resistant, and non-deforming construction for reliable accuracy. The tool features dual-sided scale markings with both metric and imperial graduations for easy, precise reading.This versatile square is equipped with a clear bubble level and an integrated scriber, allowing you to mark lines without an extra pen. Its effective spring screw clamping system ensures the ruler is easily adjustable and securely locked into position. The combination square is capable of measuring 90° and 45° angles, as well as length, depth, and width, making it the ideal all-in-one tool for a vast array of measurement, marking, and layout tasks in home improvement, engineering, carpentry, and construction projects.