E Clips for shafts are a form of Circlip and can be known as ‘E’ Type Circlips.
These clips have the advantage of being inserted from the side of the shaft rather than the end. E Clips also have the flexibility on the size of shaft they fit on to.
Metric E clips are always listed by the groove size they fit into on the shaft, and Imperial E Clips by the shaft size.
Now available to buy online: https://springfasteners.co.uk/product-category/e-clips/