Do I need a special socket to install these acorn nuts?

Acorn nuts use a standard socket like your current lug nuts — same size you already have. Install torque should match your vehicle's factory spec, so check your service manual before tightening.

Will the locking keys work on all four wheels?

The four locking nuts included are keyed the same way, so one key set secures all four lock nuts. Keep the keys safe — you'll need them to remove the wheels in the future.

Can I mix these with my existing lug nuts if I only replace some?

Yes, you can use the standard acorn nuts from this set alongside your current nuts. All 16 pieces are the same size and style, so they'll look uniform on any wheel you choose to mount them on.