Features: Crafted from premium stainless steel, this 52cm ruler combines precise measurement with discreet person defense capabilities, offering a strong and multi functional tool for professional and outdoor enthusiasts. Featuring scale for accuracy and a protective leather sheath, the sleek silver gray design ensures portability while preventing scratches or damage during daily use. Ideal for architects, engineers, and security conscious travelers who demand stable measurement tools and added person safety in city commutes or remote job . Perfect for construction blueprints, projects, or nighttime walks, its double purpose design adapts seamlessly to workshops, offices, and outdoor activity . Engineered to replace fragile plastic rulers, this heavy duty stainless steel measuring tool doubles as a compact defense accessory without compromising professional accuracy . Specifications: Component : Stainless steel Type: 3mm/5mm(optional) Length: about 52cm/20.47inch Package Includes: 1xSecurity Ruler note: Please allow 1-3cm error due to manual measurement. please sure you not mind before you bid. Due to difference between different monitors, the picture may not reflect the actual color.