- 2 x Spare Filter Slots
- 2 x Spare Spacers for 4mm-Thick Filter
- 4 x Spare 25mm Screws
- 4 x Spare 30mm Screws
- 4 x Spare Retaining Nuts
- Use Extra 2mm-Thick Filter in Evo Holder
The pair of slots can be used to accommodate a square or rectangular filter along the front of each compatible filter holder. Cokin Evo Aluminum Filter Holders can also utilize the slots at the rear of its back plate for attachment to a separately available Cokin filter holder adapter ring, which connects a Cokin filter holder to the front of a lens.
If placed between the back plate of a Cokin Evo Aluminum Filter Holder and a pair of slots along its front, the spacers enable the use of a 4mm-thick, square or rectangular filter. Whether configured with or without spacers, the 25mm-long screws hold a Cokin Evo Aluminum Filter Holder's components together and are each locked in place with a retaining nut.
Similarly, the 30mm-long screws are intended for use with a Cokin Z-Pro Series Filter Holder. However, they can also be installed on a Cokin Evo Aluminum Filter Holder, allowing it to accommodate an additional 2mm-thick filter beyond the maximum number of filter configurations permitted with the 25mm-long screws. If the 25mm-long screws are instead used to substitute the 30mm long screws on a Cokin Z-Pro Series Filter Holder, its capacity will be reduced by one 2mm-thick filter, however the overall profile of the filter holder will be lowered along its front, with the front end of each 25mm-screw prevented from extending beyond its corresponding retaining nut.