Knipex 87-09-180 Push-Button Replacement Set for 87 XX 180 Adjustment at the touch of a button directly on the workpiece Fine adjustment for optimum adaptation to different size work pieces and a comfortable gripping position Self-locking on pipes and nuts: no slipping on the workpiece and low handforce required Gripping surfaces with special hardened teeth, teeth hardness approx. 61 HRC: low wear and reliable gripping Box-joint design: high stability because of double guide