This design fits 8020 10 series aluminum extrusion. I designed this one to be stable but also easy to insert and remove.
The pre-made holes are are 4mm in diameter.
The gears in the image were made using this: thingiverse.com/thing:3575
Check it out if you like making/using gears. Its really great work.
the head of the bolt starts from the grooved recess, that way you can use any length without it pushing too far down. 8020 Base Mount
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1.4 w x
3 d x
0.551 w x
1.181 d x