Du-Bro Socket Head Sheet Metal Screws 4 x 1/2" Part No: 382. These zinc plated socket head sheet metal screws are fully threaded and have more applications than wood screws. The non-slip socket head makes hard to get at places easy! Perfect for mounting servos, landing gear straps, motor mounts, etc. These also have unlimited uses in areas outside the hobby such as household, crafts, garage, vehicles, farm, agricultural, woodworking and many more.