【Yu-packet shipping】This item will be shipped via Yu-packet. Delivery is available on Saturdays, Sundays, and national holidays. Please purchase this if you are in a hurry. This is a static electricity discharge device. Compatible screw sizes are M8 and M10. It's a popular tuning item on sites like 【Minkara】. It is said that by discharging static electricity accumulated on the car body with this device, the car's original performance is brought out. Please use it by tightening it together with screws in the engine room, etc. When using, it seems that the effect is maximized by unraveling the flat braided copper wire.