Will this fit & extend the 6 inch diameter Predator auger bit that's 31" long, so 31" + 18" = 48" so create a 4 foot post hole?

Yes. I have used it to extend both a 4 inch and 8 inch auger to get 4 foot deep hole.

What size is the drive shaft 7/8 or 3/4 round

It provides a 7/8" connection between the powerhead and the auger.

Are both the male and female ends 7/8 or is male end 3/4

I'm not sure what you mean, but I can tell you that if you had two, the male end of one would fit inside the female of another. I'm not sure of the size.

will this fit a 7/8" shaft?

Yes, it was designed to fit a 7/8" shaft.

Earthquake Auger Extension Red Black | Desertcart Faroe Islands

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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1237 kr

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Sold byAmazon Faroe IslandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Specifications

ASIN	B0000AX04Q
Best Sellers Rank	#209,587 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #171 in Auger Drill Bits
Brand	EARTHQUAKE
Brand Name	EARTHQUAKE
Customer Reviews	4.6 out of 5 stars 540 Reviews
Finish Type	Powder Coated
Finish Types	Powder Coated
Global Trade Identification Number	00012642400186
Included Components	Auger Extension
Item Dimensions	20 x 3 x 3 inches
Item Type Name	Auger Extension
Item Weight	2.5 Pounds
Item dimensions L x W x H	20 x 3 x 3 inches
Manufacturer	Ardisam, Inc.
Material	Alloy Steel
Material Type	Alloy Steel
Minimum Bore Diameter	0.47 Inches
Model	EXT18
Number of Flutes	2
Number of Pieces	1
Part Number	EXT18
Point Style	Spear Point
Set Name	Earthquake Auger Set
Shank Type	Straight
Surface Recommendation	Alloy Steel
Tool Flute Type	Straight
UPC	012642400186
Unit Count	1.0 Count
Warranty Description	1-Year Limited

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