Self-locking on pipes and nuts with low hand-force required, and no slipping on the workpiece. Fine adjustment for optimum adaptation to different workpiece sizes and comfortable hand width. Box-joint design with double guide for stability. Gripping surfaces include hardened teeth for stable gripping and high wear-resistance, with pinch guard for safety. Gripping capacity for tubes: Ø 29mm, and nuts: Ø 27mm. Max. Jaw Opening: 27mm Drop-Forged, Heat-Treated & Hardened Chrome Vanadium Steel Jaws PVC Dipped Handles Locking Box Joint 13 x Locking Jaw Positions Max. Jaw Opening: 27mm Drop-Forged, Heat-Treated & Hardened Chrome Vanadium Steel Jaws PVC Dipped Handles Locking Box Joint 13 x Locking Jaw Positions