CS Unitec Striking, Open End Wrench, Aluminum Bronze CS Unitec Non-Sparking Striking, Open End Wrenches are a part of CS Unitecs Non-Sparking/Non-Magnetic and corrosion resistant Safety Tool Line. CS Unitec Non-Magnetic Striking, Open End Wrenches are specifically designed to eliminate the risk of sparks at high-risk sites where explosive atmospheres may be present. CS Unitec Non-Sparking Striking, Open End Wrenches are available in Aluminum Bronze. CS Unitec Non-Magnetic Striking, Open End Wrenches are designed to be hit with a hammer to loosen and tighten bolts. CS Unitecs Non-Sparking Striking, Open End Wrenches are drop forged for the highest quality in hand tools.