This is a set of 4 Hurricane Security Bolts/Nuts. I used these to prevent theft of aero parts, but I removed them due to poor maintainability, so I am selling them. * M6 x L25 x P1.0 * Purchased around September 2024 and used until around August 2025. * They were working fine until removal, and there are no stripped threads or distortions. * I painted the bolt heads black for use on the aero parts, but I removed the paint with thinner, and some residue may remain. * Shipping is planned via Nekopos (a Japanese postal service). * The items in the photos are all that are included. * There may be other unnoticed scratches or dirt.