Standoff 30mm x 6mm with 3mm thread 7mm depth
Free     Thingiverse     stefi01

Standoff 30mm x 6mm with 3mm thread, 7mm depth

Customized version of ...

similar models —

Standoff 30mm x 6mm with 3mm thread, 7mm depth alternatives
Threaded Drywall Anchor
Tennessee Mats