Jaw does not fall out even at maximum opening of the wrench.Head combines slim design for accessibility with strength for performance.Laser scale in mm for pre-adjusting and accurate measurement.Wide handle for comfort in use.Accurate jaw movement.High performance alloy steel forged in single piece.Chrome plated, precision-hardened and anti-corrosion treated.Left turning screw.Standards: ISO 6787, DIN 3117, ASME B107.8 and BS 6333.IP: Industrial pack