Rivet post pressure expands legs for fast and permanent fastening.</br> Used widely for car fender, bumper, door or other car surfaces.</br> Push in type, are made of the plastic material, fit 6mm diameter hole.</br> Consisted of two parts(male and female part).</br> Insert the female part into the hole, screw the male part to the bottom, closed position.</br> To uncouple the two parts, unhook the male part by using a tool under its head.</br>