Made of aluminum-bronze that is Factory Mutual approved, these wrenches inhibit sparking and are nonmagnetic and corrosion resistant. They satisfy OSHA requirements that specify nonsparking tools for locations where flammable vapors and combustible residues are present. The wrench head pivots to accommodate a range of diameters, fitting into slots on the circumference of collars, bearings, and other machine tool components.

Warning: Do not use these tools in direct contact with acetylene.