These custom round head shoulder wood screws were manufactured at 10,000 pieces using 316 stainless steel material with plain finish. The head/shoulder combination was cold headed and the thread rolled. Shoulder dimensions were 3.8-4.0mm diameter by 5.5mm minimum in length, with the rolled thread at 15.88mm min usable thread. It’s round head was specified to 7.5mm-8.0mm diameter and 2.75mm-3.05mm height. Material certs were supplied with the parts.