Genuine OEM Nissan T25 T28 Turbo Locking Tab.
Should be used with installation of any T25 T28 turbo.
The locking tabs can prevent the nuts from backing out and ultimately result in exhaust leak and power loss.
The old ones may not be strong enough to hold the nuts in after many removal and re-installation, so be sure to get new ones! You will need 2 for each turbo.
These tabs are sold as a pair.