@model List<ElencoCertificazioniItem>
...

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
...
        <tbody>
        @{
             for (int i = 0; i < Model.Count; i++)
             {
                  <tr>
                     <td>@Html.LabelFor(m => Model[i].Id) </td>
                     <td>@Html.LabelFor(m => Model[i].description)</td>
                     <td>@Html.EditorFor(m => Model[i].Field1.Value)</td>
                     <td>@Html.EditorFor(m => Model[i].Field2.Value)</td>
                   </tr>
              }
           }
          </tbody>
         }
 ....

[HttpPost]
    [ValidateAntiForgeryToken]
    [HttpParamAction]
    public ActionResult SaveItems(List<ElencoCertificazioniItem> model)
    {
        //the items here is null!!! ;(
        return saveItems(model);
    }

public class ElencoCertificazioniItem
{
    public int Id { get; set; }
    public string description { get; set; }
    public bool? Field1 { get; set; }
    public bool? Field2 { get; set; }

}

public class HttpParamActionAttribute : ActionNameSelectorAttribute
{
    public override bool IsValidName(ControllerContext controllerContext, string actionName, MethodInfo methodInfo)
    {
        if (actionName.Equals(methodInfo.Name, StringComparison.InvariantCultureIgnoreCase))
            return true;

        var request = controllerContext.RequestContext.HttpContext.Request;
        return request[methodInfo.Name] != null;
    }
}

<tr>
    <td>
        @Html.LabelFor(m => Model[i].Id)
        @Html.HiddenFor(m => Model[i].Id)
    </td>
    <td>
        @Html.LabelFor(m => Model[i].description)
        @Html.HiddenFor(m => Model[i].description)
    </td>
    <td>@Html.EditorFor(m => Model[i].Field1)</td>
    <td>@Html.EditorFor(m => Model[i].Field2)</td>
</tr>