Professional Radius Measuring Tool with high accuracy engraved scale ensures precisely measurements for drafting and engineering tasks Essential for engineers, enthusiasts, and professional craftsmen requiring multifunctional radius measurement tool for complex project Optimizes work efficiency in woodworking shop, mechanical workshop, and construction sites with versatile radius/angles/linear measurement capabilities Ergonomic grip paired with light weight plastic construction for easy operate during extended drafting or repair tasks Features sliding mechanism for easy adjustments and rustproof coating , suit for indoor and outdoor use, Manufacturer: XINGBEI