Index Ring, .001" 

Index Ring, .001"
Part Number: 3357
Weight: 0.09 lb

Price: $9.95

In stock
Index ring used on X- and Y-axes of X3 mill. Indicates each division is .001".

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

Item No Models
175  BusyBee CX611 Craftex Small Mill
Various SX3 SIEG Small Mill
180  Grizzly G0463 Small Mill
Harbor Freight 93885 Central Machinery Small Mill
Various X3-US SIEG Small Mill
Woodstock International M1110 Shop Fox Small Mill
Click your model to see the complete parts list.