Description: High quality material, durable, stable and rustproof. Robotic arm kit without servo motors. Most parts are integratedly punch-formed at one time,which is very strong and easy to install. Assembly required - No soldering required. Simply put the robotic arm together with screws included. Great for learning robotics, electronics, Arduino programming and Python programming. Specification: Material: Stainless Steel Overall Length:83mm Overall Wwidth(Opened):1:150mm Overall Width(Closed):2:55mm Overall Thickness:54mm Package Includes: 1 Set of DIY Robot Arm Kit