Key, 3x10 mm 

Key, 3x10 mm
Part Number: 2131
Weight: 0.05 lb

Price: $0.68

In stock
Key, M3x10

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

Item No Models
100  Harbor Freight 47158 Central Machinery Micro Mill
Clarke CMD10 Metalworker Micro Mill
Various X1-US SIEG Micro Mill
17 4660 HiTorque Micro Mill 4700 HiTorque Micro Mill
Click your model to see the complete parts list.