Rivet post pressure expands legs for fast and permanent fastening. Used widely for car fender, bumper, door, side skirt or other car surface. Push in type, are made of the plastic material, fit 7mm diameter hole. Consisted of two parts(male and female part). Insert the female part into hole, push the male part to the bottom, closed position.To uncouple the two parts, unhook the male part by using a tool under its head. Product Name : Plastic Rivet;Material : Plastic Color : Black;Max. Diameter : 14mm/0.6 Inch Stem Length : 18mm/0.7 Inch ;Fit Hole Diameter : 7mm/0.3 Inch (Not Including The Pin) After Expansion Height : 20mm/0.79 Inch ;Net Weight : 12g/pcs Package Content : 40 x Plastic Rivet› Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.