HLS-10 HEICO Fastening Systems HEICO-LOCK Washers , Manufacturer Part#: HLS-10 , Manufacturer: HEICO Fastening Systems , Brand: HEICO-LOCK Washers , UOM (Inch or Metric): Metric , Material: Steel , Finish: Zinc-Flake Coated , Bolt Size: M10 , Inside Diameter: 10.70mm , Outside Diameter: 16.60mm