RC airplane builders, this Hobbypark set of 25 pushrod connectors is exactly what you need for your next build! These D2.1mm linkage stoppers work with pushrods measuring 1.8mm, 1.9mm, or 2.0mm in diameter. They're designed specifically for linear movement applications in RC aircraft - perfect for connecting control surfaces to servos. The package includes a hex wrench for easy installation and adjustment. Each connector weighs only about 0.97 grams, so they won't add unnecessary weight to your model. They're that essential hardware component that makes assembly so much easier and more precise. Before ordering, make sure to check your specific model's manual for compatibility since different RC planes might require different sizes. These are replacement parts that work with various RC airplane brands and models. Having a pack of 25 means you'll have plenty for your current project and future builds too. They're that small but crucial component that ensures your control surfaces move smoothly and accurately. If you're into RC aviation, you know how important proper linkages are for flight performance - these connectors deliver reliable performance flight after flight.