Arri Scrim - Half Double for Arrilite 600, 300W and 125W Fresnel - 5" Pearstone A-RJ45FF and although called an "expendable"

and although called an "expendable"

The FotodioX Bay 60 to 77mm Aluminum Step-Up Ring permits the use of 77mm threaded filters on lenses with a Bay 60 filter mount

in addition to its regular use as a window mount

The Sensei 58-37mm Step-Down Ring is a step-down ring permitting the use of 37mm threaded filters on a 58mm threaded lens

or even just solder some wire

Arri Scrim - Half Double for Arrilite 600, 300W and 125W Fresnel - 5" Pearstone A-RJ45FF and although called an "expendable"Scrims are metal screen mounted in a metal frame. They are placed in front of a light to reduce light intensity. Arri makes four different types of scrims. Full single this scrim covers the entire lightface and reduces the intensity of the entire light beam. Full double again this scrim covers the whole face of the light. It has two metal screens in it, reducing light intensity by two times the amount of the full single. Half single this scrim only