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.
2 EXHAUST StudS NUTS SET 1.5 X 42MM LONG
2 EXHAUST MANIFOLD NUTS 1.5 X 42 MM LONG
High Strength 2 X Exhaust Studs Nuts 42mm Long
2 EXHAUST MANIFOLD STUDS NUTS SET 1.5 x 42MM LONG
4PCS Exhaust Studs & Nuts Kit For Big Twin 1984-2015 Sportster XL 1986-2014
