Select Range in VBA using Variables

Hi all--

I'm looking up to set up a range using just variables. This is what I thought it would be, but it's not working correctly. Any help would be appreciated!

    Dim Letter1 As Long
    Dim Letter2 As Long
    Dim Number1 As Long
    Dim Number2 As Long
    
    Letter1 = 1
    Letter2 = 4
    Number1 = 6
    Number2 = 6
    
    Dim RangeSelect As Range
    
    RangeSelect = Range(Cells(Letter1, Number1), Cells(Letter2, Number2))
    RangeSelect.Select