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The Redrock Micro microMatteBox Knob Kit (Black) provides all the replacement thumbscrews you need for the microMatteBox. By changing out the microMatteBox's default blue knobs, this kit makes your matte box all black. For this feature, Redrock Micro had in mind cinematographers who are concerned about the original blue knobs showing up in reflections.
The kit includes three adjustable thumbscrews for the swing-away arm assembly, six thumbscrews for the top and side flags, and two female thumbscrews for the side flags.