These are Schumacher Racing Products factory replacement M3x4 cup point grub screws, sold in a pack of 10. Grub screws, also known as set screws, are fully threaded headless fasteners that seat flush or below the surface of a component, making them ideal for securing collars, pulleys, and adjustment points on RC vehicles. The cup point tip provides a firm bite into the mating surface to resist loosening under vibration. Having spares on hand is practical for any Schumacher build or repair. Features: M3x4 size, 3.0mm thread Cup point tip for secure grip on mating surface Headless grub screw design seats flush or below surface Pack of 10 pieces Schumacher Racing Products factory replacement part 7/7/26 cs