Description: Premium Material: The T Square Ruler is made from aluminum alloy, ensuring wear resistance, durability, and long term use while maintaining accuracy.Size: The Scriber Drawing Ruler measures 540mmx340mmx14mm/21.26inchx13.39inchx0.55inch.Multi Angle Measuring Ruler: This woodworking T square ruler features an adjustable knob that can be securely locked to allow for accurate measurements.Adjustable Length and Angle: The measuring ruler comes with 2 adjustable positioning blocks, a two axis bubble level for assistance, and clear scale. It can be easily adjusted to meet various work requirements.for Engineers and Carpenters: The layout measuring tool is specifically designed to meet the needs of engineers and carpenters and enables efficient measurement tasks. Specification: Material: Aluminum Alloy Size Chart: 540mmx340mmx14mm/21.26inchx13.39inchx0.55inch Package Includes: 1 T Square Ruler With 2 Sliders Note: Please allow slightly errors 1-2cm differences due to manual measurement.