Will these fit my factory wheels or only custom wheels?

M12x1.5 is a standard metric thread, so they'll thread onto any wheel hub that uses that pitch. The 50mm extended length means they'll protrude further than stock — confirm your wheels have enough clearance in the barrel before ordering.

Do these come with a torque spec or installation guide?

The nuts themselves are straightforward to install. Always refer to your vehicle's service manual for the correct torque specification — different platforms vary, and over-tightening aluminum can strip threads.

Can I use these as a complete lug nut replacement set, or do I need extras?

The 20-piece set covers most vehicles with four or five lugs per wheel. Count your total lug holes first — if you're running five-lug wheels, you'll have enough for four wheels plus four spares, which is solid for roadside backup.