Product review (1 stars): Don't waste your money
Just visit your local hardware store, and get some stainless steel screws (about 15 each)

Yes, these have a cone-shaped washer.  Can't see why it's needed, but if you truly feel the need for a washer, your hardware store should have some flat ones that will work just fine - or, go for nylon ones (they'll conform to the shape).

The yellow/orange color you see in the picture is just a thread lock substance.  You can pickup a small tube of this (also at your hardware store) for a couple bucks.