The Nanlite PJ-BM-AI Adjustable Iris enables full control over the light beam's size and shape, it features a multiple-blade design and can be easily added or removed from the housing when needed through the drop-in slot on the projection attachment. Created specifically for use in the PJ-BM Bowens Projection Attachment, the Nanlite PJ-BM-AI Adjustable Iris enables full control over the light beam's size and shape. It features a multiple-blade design and can be easily added or removed from the housing when needed through the drop-in slot on the projection attachment.