If you're building or repairing RC airplanes, these nylon hinges are exactly what you need for attaching control surfaces like ailerons, elevators, and rudders. Each hinge measures 0.78 inches wide by 1.41 inches long when unfolded, folding down to about 0.7 inches when installed. They're super lightweight at just 1 gram each, which matters when you're trying to keep your model aircraft light. The nylon material is flexible enough to allow full movement but durable enough to handle the stresses of flight. The 0.07-inch holes are perfect for standard steel hinge pins. You get 25 in the pack, which is plenty for multiple projects or having spares on hand. Installation is straightforward - just slot them into your pre-cut hinge slots and secure with pins. They provide smooth, reliable movement without any slop or binding. Much better than trying to make your own hinges or using inferior materials. Whether you're building from scratch or repairing damaged control surfaces, these are professional-grade hinges that'll keep your plane flying true. Just make sure they're compatible with your specific model before ordering.