Waiting needle for temporary fastening when installing the clasp ferrule.Non-slip wood knob. Thick needle diameter of 0.04 inch (1 mm), so you can fix the needle firmly without breaking even with thick fabric.Compared to temporary tapping with threads, it has less slippage and improves work efficiency. Size (approximate): Total length 0.8 inches (2 cm), Needle part 0.4 inches (1 cm), Needle diameter 0.04 inches (1 mm); Weight: 1 pair approx. 0.6 g); This product can be used repeatedly, but the clasp will gradually loosen over time. Thank you for your understanding. Instruction manual not included.