The nuts feature a self-locking design, so when they are fastened to a stud by hand, they will stop when they reach the "locking" portion. You will then need a wrench or socket to fasten it further, at which point it will "lock" in place.
Stainless Steel Exhaust Studs & Nuts For Peugeot Speedfight 2 50cc A/C 1997-2008
High Strength 2 X Exhaust Studs Nuts 42mm Long
Exhaust Studs Nuts Copper Gasket Kit For GY6 50cc 125cc 150cc
Alpha Rider 8pc Exhaust Studs & Nuts for 1984-2015 Harley Big Twin & 1986-2014 Sportster XL (Chrome, Zinc, #3/8-16, 0.375in)
