1/4 and 5/16 Knurled Knobs

1/4 and 5/16 Knurled Knobs that can hold a nut or a bolt

These files include plugs for the Hex hole to help hold a nut or bolt in place.
One for each size has a hole in it for the bolt to pass through when using a nut.
The other has no hole and is intended to hold a bolt in place.

I printed these with the Hex hole down and used support for the hex surface.
PLA 
infill 20%

The nuts and plugs were snug in the hex hole and did not need glue to hold them ( a light tap with a hammer helped).
I have included the DesignSpark files I used to create the STL files incase someone wants to alter the files.

I have started on Knobs for #6 and #8 and will put the on the site soon. 
For those of you who use Metric ,  sorry but they are not as readily available as inch in the USA. I do have some metric bolts and will try to make metric versions at some time .