This plastic bayonet lens hood is the hood which is originally supplied by Sony with their Carl Zeiss SAL-1635Z 16-35mm f/2.8 lens, and is offered here as a replacement for a lost or damaged hood.
This hood bayonets on to the plastic tabs specifically upon the outer barrel of the Carl Zeiss lens, and is made to perfectly shade at 16mm with a "full frame" camera. It won't work with any other lens.
Reviews Sony ALC-SH106 Lens Hood for the SAL-1635Z 16-35mm f/2.8 Lens (Sony Malaysia)