Will these fit my factory wheels?

M12x1.25 is a common metric thread, but verify your current lug nut specs before ordering. Measure your existing nuts or check your vehicle's service manual to confirm thread pitch and length.

Do I need to use the removal key, or can I use a standard socket?

The key is included for convenience, but a standard 21mm socket (or your vehicle's spec) will work on the hexagonal head. The key is just a backup for tight or stuck nuts.

Can these handle track duty, or are they street-only?

Aluminum lug nuts are lighter than steel and work fine for road course and autocross use. For high-stress racing or drag duty, consult your tech inspector — some series have material restrictions. Street and moderate track use poses no issue.