Stainless Steel 1/4"-20 Female to 3/8"-16 Male Convert Screw Adapter 2 Pieces 10.5mm Height

I use these with 3D prints in order to attach things to tripod mounts. They work great; both for anchoring firmly into my print, and make a good attachment to a tripod.

Fits perfectly to the 1/4 screw tripod feet. Saved over $20 bucks by purchasing these adapters. Quality item.

I use these 8mm size ones for adapting 3/8-16 tapped holes to 1/4-20 for use with camera-related equipment. These are very high quality, they are not the cheap aluminum "tripod adapters" that other photo/video-centric brands sell. These are much nicer and are tightly toleranced. I usually treat these little adapters as expendables but these ones I always keep track of.

Works

Flat head slot requires a very fat screwdriver to get a good bite on it. They work fine overall though.

It is just a bushing but it is made well with good tolerances. These have long barrels so you need to be aware of bottoming out.

Use them with my blue yeti mic.

Worked perfectly for stepping down the threads for an 1-1/8” curtain rod to hold finials.