Canon XA4-9200-806 EF Screws
Canon YA2-2347 Collar Screws
Canon YB2-1326 Collar Screw
Genuine Canon screw to retain all sizes of collar YB2-1328 for the EF 16-35 2.8 L II USM lenses and other Canon imaging products.  Package of 1 screw. Made by Canon Japan.