Loctite 222 purple low strength Threadlocker prevents loosening from shock or vibration, corrosion, and seals to prevent leakage. It also allows for simple hand tool disassembly without shearing the screw. Rebottled 222 Loctite from a bulk container into .34 fl oz (10ml) bottle size to make this a great price. 16g bottled weight. (note this is .34 fl oz which is just under half bottle full) suitable for; general engineering purpose, metal threaded assemblies, steel, stainless steel, brass, alloy and plated surfaces, nuts, studs, screws etc. In my experience with firearms to prevent screws loosening due to shock and vibration, 222 is spot on for; scope ring screws, quad guard screws, grub screws, and any other small screws that you want to stay put, but don’t want to strip the thread or head when trying to torque loosen with hand tools. 222 tolerates minor surface contaminations from industrial oils, motor oils, gun oils, cutting fluids, anti-corrosion and protection fluids. * Listing is for one bottle, but request as many as you want.