Fixed Pin Spanner Wrench Capacity 3-3/4 to 4 In. Length 11-1/4 In.Material Nickel Aluminum Bronze Finish Non-Sparking Non-Magnetic Corrosion Resistant Application For Use Where Flammable or Combustible Vapors Liquids Dust or Residue are Present Near Highly Sensitive Magnetic Equipment MRI and Clean Room Environments Meets/Exceeds FM Approved OSHA NFPA MSHA Federal GSA Military DOE ASTM A342