Bolt grips are made from high carbon steel to endure long life and durability, however, the bolt grips still need to be maintained properly.
Use
To maintain bolt grips, you need to use them correctly; this means sticking to what size bolt the grips are recommended to remove, as they will become damaged if they are not used correctly.
Storage
When you have finished using your bolt grips, make sure you place them in their storage case or in a safe place to avoid damage.