The EUROLITE Filter Frame Theatre 300/500 bk is an octagonal metal filter frame designed for use with compatible Theatre 300/500 spotlights. It enables colour filter or similar media to be placed in front of the fixture to add colour to a white beam. The frame is made from 0.5 mm metal and has a black finish. It features a 22 x 22 mm grid size and accommodates a spotlight slot measuring 17 x 17 cm. Its dimensions are 16.8 x 16.8 cm with a 13 cm diameter, and it weighs 0.14 kg.