Rivet post pressure expands legs for fast and permanent fastening. Used widely for car , bumper, door or other car surface. Push in type, are made of the plastic material. Insert the female part into hole, push the male part to the bottom, closed position. Screw Body Door Trim Panel Hood Under Engine Splash Guard Rivet Fastener Clips Plastic Push-Type Bumper Retainer Product Name: Plastic Rivet Material: Plastic; Color: Black Dimensions: 20 x 15mm/07" x 06"(L x D MAX.) Fit Hole Diameter: 7mm Package Contents: 100(+/-2%) x Plastic Rivets Only the above package content, other products are not included. Note: Light 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.