Permatexs Medium-Strength Threadlocker Blue is ideal for all nut and bolt applications 1/4? to 3/4? (6mm to 20mm). Threadlocker Blue eliminates need for stocking expensive lock nuts and lock washers and locks and seals while preventing parts loosening due to vibration. Protects threads from corrosion. Threadlocker BLUE is easily removable with hand tools for easy disassembly. The Gel formula provides liquid-reliability without drips, globs, mess or waste and is available in convenient dispensing systems: choose GEL TWIST pin-point applicator or the GEL SQUEEZE applicator. (Mil-S-46163A, Type II, Grade N).