Hipshot probably buys the screws from McMasters, and then has them plated along with the rest of the parts. I use Hipshot HB1's on all the basses I build, and they come with......#2 x 3/8" Pan Head Sheet Metal Screws, plated to match the tuners.
They need to use the Flat Head screws on the D-Tuner, because the plate has to slide over top of them.
They need to use the Flat Head screws on the D-Tuner, because the plate has to slide over top of them.