These rivet fasteners are made of plastic material, suitable for car use.
These clips are used by many manufacturers to hold all pieces of trim and upholstery including carpet, door cards, roof lining, engine covers, landing panels, boot linings, wheel arch linings etc.
This is non-OEM product, accessoy only!

• Size: 22 x 20mm/ 0.87 x 0.78 inches(L*Max.D); Color: Black; Product Name: Clips/Rivets/Fastener; Interchange Part Number: Under Engine Splash Guard Rivet Fastener Clips
• Manufacturer Part Number: Plastic Push-Type Bumper Retainer Clip; Other Part Number: Screw Fender Body Door Trim Panel Hood; Applications1: Defender Door Card Interior Weatherstrip Moulding
• Applications2: NYLON CHRISTMAS TREE Carpet Floor Mat Clips; Material: Plastic; Package Content: 50(+/-2%) x Car Rivets
• Fit Hole Size: 8mm/ 0.31 inches; Head Diameter(max.): 20mm/ 0.78 inches; Stem Length: 8mm/ 0.31 inches
• Total Length: 22mm/ 0.87 inches; Shell Color: Black; Fit for: Nissan

Size: 22 x 20mm/ 0.87 x 0.78 inches(L*Max.D); Color: Black; Product Name: Clips/Rivets/Fastener; Interchange Part Number: Under Engine Splash Guard Rivet Fastener Clipsuxcell