Canon XA4-9170-507 EOS Screws
Canon XA4-9170-607 EOS Screws
Canon XA4-9170-609 EF-EOS Screws
Canon XA4-9170-707 EOS Screws
Canon XA4-9200-606 EF Screws
Canon XA9-1354 EF Screws
Canon YA2-0929 EF Screws
Genuine Canon collar retaining screws for the collar used in the EF 70-200 2.8 L USM, EF 70-200 2.8 L IS USM, and the EF 70-200 2.8 L IS II USM lenses.  Package of 1 screw. Made by Canon Japan.
The collar used with this screw is in stock here.