HLB-1 HEICO Fastening Systems HEICO-LOCK Washers , Manufacturer Part#: HLB-1 , Manufacturer: HEICO Fastening Systems , Brand: HEICO-LOCK Washers , UOM (Inch or Metric): Inch , Material: Steel , Finish: Zinc-Flake Coated , Bolt Size: 1 Inch UNC , Inside Diameter: 1.100 Inch , Outside Diameter: 1.910 Inch