Marine Grade Stainless Steel Female Side Press Studs with matching Male Stud Screws. 
Pack of twenty. 
Self tapping press stud bases (MALE) with the two elements required to make the female section of the press stud(D-cap + Socket). 
These are trade quality and are what we have been using in our trimming and upholstery section as well as wholesaling to the marine and auto trimming trade for twenty five years.
Quality you can trust.