Feature: 1. The terminal expansion board can be screwed directly to the terminal on the thread, easy to operate, reliable and convenient. 2. Added pins for easy connection to digital or analog sensors. 3. Can plug in the controller and use this shield to avoid poor port connection. 4. With a stacking head, more shield can be stacked on the top, and sensors and servos can be directly connected to the screw shield. 5. Practical DIY electronic components, suitable for R3, reliable and durable, and good working stability. Specification: Condition: 100% Brand New Item Type: Stud Terminal Expansion Board Material: Metal, Plastic Application : For R3 Weight: Approx. 38g / 1.3oz Product Weight: Approx. 36g / 1.3oz Product Size: Approx. 7.1x5.6x2cm / 2.8x2.2x0.8in. Package List: 1 x Stud Terminal Expansion Board Note: Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.