Amazon.com : CAMVATE 1/4"-20 Female Screw Double Thread Adapter for Extension Arm - 2039 : Electronics
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CAMVATE 1/4"-20 Female to 3/8"-16 Male Screw Adapter C0979 B&H
Binding Post Barrel Male and Female Screw China Manufacturer
2-56 Male-Female Threaded 0.5 in. Long Hex Aluminum Standoff - AndyMark, Inc