PennEngineering’s PEM X-Press self-clinching flush-head studs quickly mate with push-on plastic nuts or other plastic fasteners in thin metal assemblies. A coarse thread reduces assembly time and enhances retention force of the stud once it’s installed; and it also accommodates paints and coatings. – See more at: http://www.fastener-world.com.tw/new/news_detail.php?id=4543#sthash.POd8eqj4.MK9BWqVY.dpuf