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BULB SPECIFICATION: T20 W21/5W 7443 automotive bulbs with dual filament design, 12V 21/5W power rating, featuring W3x16Q socket type for reliable performance MULTI-FUNCTION APPLICATION: Ideal for stop lights, tail lights, brake lights, and daytime running lights (DRL) in cars, lorries, and vans PRECISE DIMENSIONS: Bulb measures 20mm in diameter and 16mm in width with 3mm base height, ensuring proper fit in standard T20 sockets DUAL FILAMENT TECHNOLOGY: Features double filament construction for versatile lighting functions, allowing simultaneous operation of running and brake lights VALUE PACK: Includes 10 replacement bulbs per pack, providing convenient spares for multiple vehicles or future replacements