Permatex Permanent Strength Threadlocker Red is a permanent, high strength product that is applied to fasteners 3/8" to 1" (10mm to 25mm) in size before assembly. Designed for securing parts that must withstand heavy shock, vibration, or extreme chemical or environmental conditions. Localized heating and hand tools are required to separate parts. OEM specified. Suggested Applications: Assembly with air tools, cylinder block bolts, ring gear bolts, transmission shaft bolts.