Model Code Clarification Help Needed

{
  "format_version" : "1.12.0",
  "minecraft:geometry" : [
    {
      "description" : {
        "identifier" : "geometry.createdaqua_life_bot",
        "texture_width" : 454,
        "texture_height" : 48,
        "visible_bounds_width" : 4,
        "visible_bounds_height" : 4,
        "visible_bounds_offset" : [
          0,
          1,
          0
        ]

My Inquiry is in regards to what the “Visible Bounds Width”, “Visible Bounds Height”, & the “Visible Bounds Offset” is for & how to utilize it. I have an issue on a model I am making where in-game it has small gaps (smaller than the pixel size) between some edges. I have done extensive attempts to try to get this issue fixed, but to no avail, primarily because I have no clue what these three variables listed above should be for my model.

visual of the issue ingame: