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Thread Locking Insert: 1-8 Internal Thread, 1-3/8-12 External Thread, UNC, 1-1/4 OAL is a thread repair and reinforcement product used to secure fasteners in place to prevent loosening from vibration or torque. Its UNC (Unified National Coarse) threads make it suitable for a wide range of applications across various industries such as automotive, aerospace, construction, and machinery repair. It is ideal for mechanics, maintenance professionals, and DIYers looking to secure fasteners permanently in their projects.