Need a set for an INTERNAL snap ring.
Internal Circlip Pliers
Internal circlips are designed to be fitted inside a hollow, cylindrical housing or bore. The spring action pushes outward against the sides, so it’s a radiating pressure that holds the ring in place.
Internal circlip pliers work the opposite way around to external versions. When the tips of internal circlip pliers are inserted into the holes on the snap ring, squeezing the handle results in the plier tips closing together. Once the C-clip is in position, the handles can be released, and the ring returns to its maximum diameter.
source:
https://uk.rs-online.com/web/generalDisplay.html?id=ideas-and-advice/circlip-pliers-guide