Nanlite FL-11 Fresnel Lens with Barndoors for Forza 60

The FL-11 Fresnel Lens for Forza 60 from NanLite modifies the light's wide beam spread to an adjustable 10 to 45-degree flood-to-spot beam angle. Benefitting from NanLite's Quick Change Modifier Mount, the Fresnel lens offers push-button and quarter turn attachment to the specifically designed NanLite Forza 60 light modifier mount. The included barndoors allow further beam spread adjustment to facilitate selective lighting. A padded carrying case is included for storage and transport.

Source: B&H
https://www.bhphotovideo.com/c/product/1476455-REG/nanlite_fl_11_fresnel_lens_for.html