Andoer 100mm Square Filter Holder with 82mm Filter Adapter Ring All Metal for Lee Hitech Singh-Ray Cokin Z Series Filter The Filter Holder is specially adapted for 100 * 100mm (4 With 82mm filter adapter ring, can hold CPL filter simultaneously. Made of all metal, durable. There are screws on the ring to keep the filter set much steady. It can be precisely adjusted and attached to the lens by means of a screw-in adapter ring.