0.195" Thk, 3.25" Mounting Hole, 3.54" Dia Outside Ring, Nickel Chrome Plated, Wire Form, Fan Guard Fan Guard Type Guard, Wire Form Used On 3-5/8 Inch Fan RoHS Compliant Mounting Hole Center 3.25 Inch Thickness 0.195 Inch Outer Ring Diameter 3.54 Inch...