General description A pack of 100 self-tapping screws designed for securing number plates to the front and rear of cars, featuring a blue flip-top cap. Technical specifications Size: 8 x 3/4" (4.2 x 19mm) Material: Zinc plated mild steel Cap material: Polypropylene (PP) Cap colour: Blue Other information Self-tapping screws with different colour caps available: 31538 (white), 31539 (yellow), 31540 (black).