Will these fit my wheel studs?

M12x1.5 is the most common thread pitch for modern vehicles. Check your vehicle's service manual or existing lug nuts to confirm thread size and pitch before ordering.

Do I need to replace all 20 at once?

You buy a full set of 20, so you have spares. Most vehicles need 4–5 per wheel depending on design. Extra nuts are useful for storage or future wheel swaps.

Will the purple spike finish fade or chip?

The polyurethane grooved finish is formulated to resist corrosion and maintain color. Normal road salt and brake dust won't strip it, though heavy curb contact or aggressive wheel cleaning can mark any finish over time.