Cute as a button, these button-head hex screws are what we suggest for putting together a project with our slotted extruded aluminium. Use a 2.5mm hex wrench to attach/detach. This length is good for attaching something about 2mm/0.08" thick to 20x20 extrusion. Comes in a pack of 50. M4 20 threads/cm (0.5mm pitch), 8mm threaded body. https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2023-03-06 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2023-12-27 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2024-09-19 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2024-11-29 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2024-11-30 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2025-04-09 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2025-08-06 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2025-11-28 https://elecena.pl/product/22710833/button-hex-machine-screw-m4-thread-8mm-long-pack-of-50-dicontinued 2025-11-29