Loctite Threadlocker Red 271 is designed to lock and seal threaded fasteners permanently and prevent loosening from vibration. Ideal for fasteners up to 1” (25mm), this unique formula is great for engines, machinery, and vehicles for valve covers, water pumps, and alternators. Loctite Threadlocker Red 271 is moisture resistant and protects threads from leaks, rusting, and corrosion while eliminating the need to stock up on expensive lock nuts and washers. Pack of 6.