Knipex 00 31 20 V01 US Cobra Pliers Set (2 Piece) Fine adjustment: ensures optimum adjustment to differently sized workpieces and user-friendly handle position Self-locking functionality requires minimal hand force and results in zero slippage on nuts and pipes, one-hand adjustment for easy operation Equipped with an anti-pinching guard to prevent finger crushing, box-joint design employs a bilateral guide to withstand large loads Gripping surfaces fashioned with special induction-hardened teeth for low wear and secure gripping; teeth hardness approximately 61 HRC Constructed with oil-hardened and tempered chrome vanadium electric steel for strength and durability