10mm spacer for M6 or 1/4" countersunk bolts

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5767326.

Countersunk spacer, 10mm in height with an ID appropriate for M6 and 1/4" bolts.

The version I actually printed was a little tight, I edited the ID to have a little more clearance but I have not printed it myself to verify.

Either way, I've also included the f3d file because I'm a communist and I believe in the free sharing of intellectual property for all.

<3