For the source text click/tap here: Shekalim 21
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Rabbi Yose says: They are all ritually pure, except for the basket, and the shovel, and the meritza, which are specifically used for graves, to gather up the bones of the dead. These tools must be presumed to be ritually impure, but in general, vessels are presumed to be pure.
During the Second Temple period people were buried in temporary graves and after their flesh decomposed their bones were moved to permanent family burial caves. The basket was a special one that was used to collect the bones.
The shovel had a wide head and a long handle, held in both hands; when associated with a basket, as it is here, it was used for digging as well as the collection of bones for burial. The meritza in this context was a tool similar to a pickax, also called a dolabra, with which one could extract large stones and then push them into place to close a burial cave.