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
5/16"-24 Serrated Exhaust Flange Nuts For Harley Big Twin Touring 1984-25 #7593
Threaded exhaust manifold for DKW RT 175, 175 S/VS, 200/2, 200 S/VS, 350 S
XJ600 XJ400 Diversion S/N 1992-2003 4-2 Exhaust Silencer Kit Oval End Cans 230SS
S-Y10RFT10-ZC/2 - Exhaust System Akrapovic Evolution Line Yamaha YZF-R1 09-14
YAMAHA XV535 1987-2003 FULL 2-2 EXHAUST 550mm SILENCER SLASHCUT BAFFLE
