Thierry: The first picture is of the positioning dowel used when mounting road wheels: it screws into your rotor; when two or more lugs are started, the tool can be removed and the rest of the lug nuts can be easily screwed in without trying to match the wheel holes to the rotor holes...it does it for you! It is a useful part of your tool kit! No idea what the other pictured item is. I've enjoyed your posts, and good luck with your almost-finished Pagoda. The best part is ahead: driving it! Jon