RC airplane builders, these LUORNG nylon hinges are exactly what you need for smooth, reliable control surface movement! The 24-piece pack gives you plenty for multiple builds or having spares on hand. At 16x29mm when unfolded, they're the perfect size for most RC aircraft without adding unnecessary weight. The nylon material is flexible yet durable, handling the constant movement of ailerons, elevators, and rudders without wearing out quickly. The pinned design allows for that smooth 90-degree up and down movement that's crucial for precise control. Installation is straightforward - for foam planes like KT boards, you just cut slots, add hot glue, and insert; for balsa wood, CA glue works perfectly. The 1.3mm hole diameter accommodates standard mounting methods. What's great is how they fold to about 30 degrees, making installation much easier than rigid hinges. I've used these on several builds, and they provide that consistent, slop-free movement that makes flying so much more predictable and enjoyable. Whether you're building from kits, scratch-building, or repairing damaged control surfaces, these hinges deliver professional results at a very reasonable price. Definitely a must-have component in your RC building supplies that ensures your planes fly as good as they look!