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Wheel simulator kits rely on stud extenders to give the chrome look a place to mount, and this jam nut is what keeps those extenders snug and secure. It's built to the same 1-3/8" OD spec as the extenders in most simulator kits, with a 41mm hex for a solid wrench grip during installation.
A simple replacement part that keeps your wheel simulator kit tight and rattle-free mile after mile.