Product Description
Manufacturer part number: 3900-4133
- 3" 1-1/2"~8 Threaded Backplate for a 4-Jaw Chucks
- Fits most plain back chucks.
- Must be machined for concentricity.
- Made of high grade casting steel.
- Assembly instructions included.
- Bolt circle is 2.6".
- Number of bolt holes is 4.
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