Fixed Pin Spanner Wrench Capacity 15/32 to 9/16 In. Length 4-1/4 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