Isn't the part on the right part of the sim eject mechanism?
EDIT:
Image
iPhone 4/4s eject mechanism, so yes it is
ive always used a paperclip for getting my SIM card out? where is this tool you speak of? ive heard about lidquid metal tool etc blah blah, but i never recall actually seeing one in my box. and i have like 12 different iPhone boxes lol