There are your standard Philips-head 4-40 screws. They are 1/4" long and come in packs of ten. This is the screw size we use in most of the holes for our breakout boards. Check below for other associated hardware. https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2011-04-16 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2011-12-16 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2016-11-25 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2016-11-28 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2016-11-29 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2016-12-09 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2016-12-13 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2017-11-24 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2017-11-28 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2018-05-05 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2018-11-21 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2018-11-27 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2022-02-21 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2025-04-14 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2025-11-14 https://elecena.pl/product/1664734/screw-phillips-head-1-4-4-40-10-pack 2025-11-16