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