These FAIPLLOCK9 Faithfull Locking Pliers are effective through the application of serrated curved jaws. They are made from high-quality steel with hardened and tempered jaws and a long-lasting finish. They have a spring action for easy clamping and release, with a quick release lever and a knurled screw for adjusting locking capacity. Capacity: 41mm. Ref: UTTK14718