Each professional quality 150mm Plier Wrench is manufactured from special high-grade tool steel, oil hardened and tempered. Smoothly ground heads and faces with cutting edges separately induction hardened. Knipex Plier Wrench Each professional quality 150mm Plier Wrench is manufactured from special high-grade tool steel, oil hardened and tempered. Smoothly ground heads and faces with cutting edges separately induction hardened. Designed for working on nuts and unions especially components with finished surfaces, ie. plated or burnished. The unique cam action jaws give a secure and powerful grip, which increases as more pressure is applied. The cam also allows the tool to be used with a ratcheting action for speed fastening. Fitted with ergonomically designed plastic coated handles, which deliver comfort even when used for prolonged periods. A highly desirable tool for professional plumbers and various other tradesmen.