Adjustable wrench central knob 8 in chrome. the clamp does not fall even if the wrench is opened to the maximum. scale in mm to preset and make precise measurements. in parallel with an angle of 15°, the clamps offer an firm grip and the best reach high performance alloy steel forged in one piece chrome finish, precision hardened and anti-corrosion treated standards: iso 6787, din 3117, asme b107.8-2003 and bs 6333 -1 blister and 2 industrial packaging