Canon X91-1738-550 EF Screws
Canon YA2-8001 EF Screws
Canon XA4-9200-606 EF Screws
Canon XA1-1200-559 EF Screws
Canon YB2-0033 Zoom Collar
Genuine Canon Zoom Collar for the EF 16-35 2.8 L USM, EF 16-35 2.8 L II USM, and EF 17-40 4.0 L USM lenses. Package of 1 collar. Made by Canon Japan. The screws used to retain this collar are in stock here.