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This is a visually reconstructed copy of Prusa Research's P-Drill*. The drill was a part of the i3 MK2 to MK2s upgrade and was used to enlarge the bed mounting holes for U-bolts.
The part was not included in the latest MK2.5S upgrade kit (and I couldn't find it online).
Some similarities/differences between the K-Drill and P-Drill:
This takes a 1/8" drill bit (3.175 mm)
Two 12mm socket cap M3 screws are used to secure the bit
Two M3 hex nuts are inserted in the slots to capture the screws (but square nuts can also be used)
This is the K-Drill to distinguish it from the P-Drill