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.

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Earthquake Auger Extension, Red/Black

Product ID: 213211192

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Specifications

ASIN	B0000AX04Q
Best Sellers Rank	#453,091 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #324 in Auger Drill Bits
Brand	EARTHQUAKE
Brand Name	EARTHQUAKE
Customer Reviews	4.6 out of 5 stars 542 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
Point Style	Spear Point
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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Earthquake Auger Extension, Red/Black

Description

Specifications

Common Questions