Bolt+Screw
thingiverse
Here is the rewritten text: You're looking at an M20 nut and screw with a unique conical shape on top. If you need to modify its dimensions, I've included the STEP files for your convenience.
Download Model from thingiverse
With this file you will be able to print Bolt+Screw with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Bolt+Screw.