Many guided knife sharpeners include L-shaped Allen keys, the least expensive tool to handle hex screws. Hex screwdrivers are much easier to use than Allen keys. If you use your sharpener on a regular basis, hex screwdrivers will make your life comfortable.
The set includes six hex screwdrivers from 1.5 mm to 5 mm and a holder made of PLA thermoplastic with non-slip rubber pads.