Strain Relief Bushing for Power Cords
Heyco SR 6W-1,  PN: 1184
Cord size .3",  Hole size .5"
for 18/2 and 16/2 cords
(Quantity 5)
 

This item is the Heyco SR 6W-1, Part no: 1184, shown in green above.
Use the hole dimensions from this chart for the holes below.

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