They are black, rack screws... They hold equipment in place, and screw into the holes, in the rack, on the inside of the road case... Not much else to say..!  Yes, they blend in with the amps, drawers, and so on... Yes,  you can see them on the chrome plate, on the edge of the mixer.. So don't use them in that location..!  It's a no-brainer.!  Are they good screws.? Well, I've had better, but they didn't come in a box..! ( and I was younger then..)  If you need colored screws to match your equipment, then these are as good as any..