Pop, STBUP 1/8, Back-Up Washers (Pop), Unit of Measure: Inch, 0.131 Inch Inner Diameter, 0.375 Inch Outer Diameter, Material: Stainless Steel, Finish: Plain, Overall Thickness: 0.048 Inch, Bolt Size: 1/8 Inch, ECCN: EAR99, HTS Code: 7618.23.0000, RoHS 3 Compliant: Yes, Shape: Round