SMTPTL Micro Gearbox Keychain | Precision Mechanical Transmission Model for Technical Enthusiasts Engineering-Grade Miniature – Educational Toy STEM Professionals

About this item

• Fully operational miniature model of a manual gear transmission system
• Transparent housing for unobstructed visualization of gear interaction
• Crank-driven actuation mimics real-world torque transfer phenomena
• Ideal for automotive engineers, product designers, STEM educators, and technical hobbyists
• Functions as both a conceptual teaching model and kinetic fidget device