Lee Filters Foundation Holder System Kit
This kit contains all the components necessary to construct a versatile holder which will take up to four filters - you choose which combinations of filter thicknesses you want to use by selecting and fitting the appropriate filter guides. (Additional guides can be purchased separately.)
Once constructed, the holder clips easily onto the adaptor ring using a smooth quick-release spring-loaded mechanism. The holder can be rotated to position filters exactly where you want them.