Instruction:A Thread Extender(Wheel Stud Extender or Lug Nut Extender) is a two-piece fastener system designed to add length to your vehicle's existing wheel studs. It consists of two parts:The Inner Nut (The "Extender"): This is a hollow,threaded nut that looks like a thick sleeve. It has two sets of threads:Internal Threads: These screw onto your vehicle's factory wheel stud. External Threads: These become the new, longer stud for your wheel to mount onto. The Outer Lug Nut: This is a standard lug nut that threads onto the new external threads of the inner nut to secure the wheel.