The Pro 100mm Filter Holder from Fotodiox is made for filters that are 100mm wide such as the Fotodiox Pro 100x133mm filters and the Cokin X-Pro (L) Series filters. It can hold standard 1.6-2.0mm thick filters and can be adjusted to hold 4mm thick filters as well.
The holder is large enough that it won't vignette on most lenses longer than 20mm (in 35mm format). When shooting with lenses wider than 20mm, the holder can be reversed, so that the filter goes where the adapter ring normally goes and vice versa. This keeps the filter holders out of view of the lens.
This holder requires the use of an adapter ring to mount it to your lens, which must be purchased separately.