Will these work with my current wheels?

M12 x 1.5 is a common pattern, but you'll need to confirm your vehicle uses this thread size before ordering. Check your OEM lug nuts or service manual to verify fitment.

Can I swap the spike on and off easily?

The spike is designed to be removable, so you can switch between spiked and non-spiked looks. The removal mechanism isn't detailed in the product specs — test-fit before relying on it for frequent changes.

Do these need tightening to a specific torque spec?

Refer to your vehicle's service manual for the correct torque spec. Overtightening aluminum lug nuts can cause damage; using a calibrated torque wrench is the safest approach.