These are 6-32 Black Button Head 6-32 Allen Key Bolts. I wanted 6-32 bolts in the form of a Black Button Head Allen Key Bolt. None were available so I had my own bolts custom made. These bolts are very rare and are not available anywhere else from my extensive research. Button Head Allen Key Bolts look so much cleaner compared to a Phillips Head Screw. Singularity Computers bolts, nuts and washers are black zinc plated steel and have no printing on them. They are not just your average bolt, they are custom made and configured specifically to look as clean as possible. All lengths are available for any potential configuration. They are perfect for high end water-cooled systems and modding. This is what I use in my own builds. 6-32 is compatible with EK, XSPC, Coolgate, Magicool and Swiftech Radiators.