Craftsman 320.66810 Operator's Manual page 25

20.0 VOLT LITHIUM=ION CORDLESS 1/2=iN. iMPACT WRENCH MODEL NO.
320. 66810
The Model Number will be found on the Nameplate attached to Impact Wrench.
Always mention the Model Number when ordering parts for this tool.
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66810 ManuaLRevised_09 0407 Page 25