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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Earthquake Auger Extension, Red/Black

Product ID: 2372472

Details

Brand
EARTHQUAKE
Cutting Diameter
18 inches
Finish Type
Powder Coated
Material
Alloy Steel
Shank Type
Straight

📏18-inch extension length

🔩Mounting hardware included

🛠️Fully-welded steel durability

$227.09

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

❄️ Drill Deeper, Work Smarter – Don’t Let Ice Hold You Back!

BUILT TO LAST - Crafted from fully-welded alloy steel for unmatched strength and longevity in tough ice conditions.
READY TO INSTALL - Comes with all necessary mounting hardware for quick, hassle-free setup—get drilling faster.
EXTEND YOUR REACH - Gain extra drilling depth effortlessly with an 18-inch extension—no more bending over or buried auger heads.
STRIKING DURABILITY - Finished with Eskimo® red powder-coat paint that resists corrosion and stands out on the ice.
TRUSTED PERFORMANCE - Join thousands of pros who rely on Earthquake’s 4.6-star rated extension for reliable, heavy-duty use.

The Earthquake 18-inch Auger Extension is a fully-welded alloy steel accessory designed to increase drilling depth in thick ice. Featuring a durable red powder-coat finish and included mounting hardware, it offers easy installation and long-lasting performance trusted by professionals and enthusiasts alike.

Specifications

ASIN	B0000AX04Q
Best Sellers Rank	#260,655 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #176 in Auger Drill Bits
Brand Name	EARTHQUAKE
Customer Reviews	4.6 4.6 out of 5 stars (543)
Cutting Diameter	18 inches
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
Manufacturer	Ardisam, Inc.
Material Type	Alloy Steel
Minimum Bore Diameter	0.47 inches
Model	EXT18
Number of Flutes	2
Number of Packs	1
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 Count
Warranty Description	1-Year Limited

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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$227.09

Duties & taxes included

In stock

Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Ecuador.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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Best international shipping I've ever tried. Worth every penny!

3 days ago

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