HLS-39SS HEICO Fastening Systems HEICO-LOCK Washers , Manufacturer Part#: HLS-39SS , Manufacturer: HEICO Fastening Systems , Brand: HEICO-LOCK Washers , UOM (Inch or Metric): Metric , Material: Stainless Steel , Finish: AISI 316L , Bolt Size: 1-1/2 Inch UNC (M39) , Inside Diameter: 1.590 Inch (40.40mm) , Outside Diameter: 2.300 Inch (58.50mm)