Genuine Canon lens mount screws for the EF 100 2.8 Macro L IS USM, EF 17-40 L USM, EF 24-70 2.8 L USM, EF 28-105 4.0 L IS USM, and other Canon imaging products. This screw is also used to replace XA4-9200-806. Package of 4 screws. Made by Canon Japan.