These cones are made from Brass and can be delivered plated or as you see them (raw brass). The threads are M7x0.75. This is a common pitch and you should be able to find a tap on Amazon, MSC Direct, or Victor Machine.
We offer 5 plating options: Raw (brass), Bright Nickle, Opaque black, Black Chrome, or 24kt gold, or white rhodium). Please allow 3-5 days for shipping as we plate the cones when you order.