Semipermanent blue thread locker creates a strong but removable bond for bolts - Easy to use, just add a few drops to the bolt before tightening and is removable with normal hand tools. With our Xtreme Thread Locker Removable 50ml solution, safely prevent up to 20 mm diameter nuts, bolts, bearings, fasteners, and screws from loosening by locking them when tightened with a strong, handy easy to apply formula.