Permatex Red ThreadlockerHigh-strength Red Threadlocker prevents hardware from loosening and erases the need to install expensive Nylock nuts, lock washers, etc. Not only does Red Threadlocker lock and seal threaded parts securely to prevent loosening from vibration or unwanted contact, but Red Threadlocker also protects threads from corrosion - ensuring long-lasting protection.The maximum strength "red" formula provides the most steadfast resistance to disassembly and is ideal for larger nut and bolt applications from 3/8"to 1"(10mm to 25mm). For smaller fasteners or less extreme conditions, use medium-duty Blue Threadlocker from Permatex.Features: Highly penetrative, low viscosityliquid threadlocker Red, maximum strength "permanent" formula High strength threadlocker for heavy-duty applications 3/8"to 1"(10mm to 25mm) Especially well-suited for permanently locking studs and press fits Adds 3,000 PSI holding power on slip and press fit assemblies May require heat or tools for removal