Permatex High Strength Threadlocker Red: Locks Studs, Bushings Large Fasteners Against Vibration Loosening; Uses: Rocker Arm, Studs, Frame Shock Absorber Bolts; Designed For Larger Fasteners 3/4″ To 1″ (9.5 To 25 Mm) In Size. Permatex, Made For The Professional. Made In U.S.A. Oem Specified. Designed For Larger Fasteners. Locks Fasteners Against Vibration Loosening.