The Cokin A Series Filter Holder is designed to accommodate multiple Cokin A Series Filters in order to help create the shot you envision. It can hold up to three rectangular filters, or two rectangular filters and one round filter such as a rotating circular polarizer, for the Cokin A Series Filter Holders.
Rectangular Cokin A Series Filters are 67mm-wide and 1.6mm-thick. A Cokin A Series Filter Holder Adapter Ring can be used to connect this filter holder to the front of a lens.