The 85mm (3.35"/P Size) Modular Holder is unique in that it has an aluminum backplate which stands it apart from other similar holders. The holder is completely versatile and allows for up to three filter slots to be fitted to the front to take either standard 85mm (P size) filters, or even, by using the spacers provided, 4mm glass filters. All holder comes pre-assembled with all 3 slots. An assembly guide, 6 x short screws, 2 x spare long screws and 2 x spare nuts are also included in the package. Additional spares kits are available for purchase separately.