11Pcs TT L121800 CNC'd Aluminum Camera Fixture Plates 3.5x2" Threaded Inserts
These are made by Tooling Tech. Custom aluminum pieces
3.5" Total length by 2" total width
There's 4 threaded screw holes that span 1.5" apart both L and w
The larger holes are 1-1/8" apart width.
Presumably these measurements fit up, hopefully to a variety of pieces! They were likely pretty expensive and are very well made.
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