Key, 2x18 mm 

Key, 2x18 mm
Part Number: 2110
Weight: 0.05 lb

Price: $0.60

In stock
Key, M2x18

In your instruction manual, this part appears on the parts list as:

Item No Models
60  Harbor Freight 47158 Central Machinery Micro Mill
Clarke CMD10 Metalworker Micro Mill
Various X1-US SIEG Micro Mill
Click your model to see the complete parts list.