CS Unitec 12-Point Single End Box Wrench, Aluminum Bronze CS Unitec Non-Sparking / Non-Magnetic Single End Box Wrenches are a part of CS Unitecs Non-Sparking/Non-Magnetic and corrosion resistant Safety Tool Line. CS Unitec Non-Magnetic Single End Box Wrenches are specifically designed to eliminate the risk of sparks at high-risk sites where explosive atmospheres may be present. CS Unitec Non-Sparking Single End Box Wrenches are available in Aluminum Bronze. CS Unitec Non-Magnetic Single End Box Wrenches are designed to loosen and tighten bolts. CS Unitecs Non-Sparking Single End Box Wrenches are drop forged for the highest quality in hand tools.