Are the diamonds vaccuum brazed on or electroplated ?

This specific model is sintered diamond hole saw. If you prefer electroplated or vacuum brazed, we have them as well. Here are the links: https://www.amazon.com/dp/B010WAKMVO/ https://www.amazon.com/dp/B08R34Y7Y6/ We also have this specific vacuum brazed model with 3/8 inch shank: https://www.amazon.com/dp/B09523Z8J3/

What size extension should I buy to be able to drill down a foot deep? Bought standard and it didnt fit the bit, then 7/16 was too big for drill

You may want to use an extension like this: https://www.amazon.com/Century-Drill-Tool-38112-Extension/dp/B00ABDYV4C

What is the diameter of the resulting core (inside dia)?

The diameter of the removed core would depend on the drilling angle, cutting conditions, and the material removed due to friction. Having said that, you could expect it to be close to 1-3/4 inches.

will this work with fiberglass?

Yes, it can work with fiberglass. We recommend using water for cooling. And using a template (a piece of plywood with a 2-inch hole) will help you position the tool.

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2" Diamond Masonry Hole Saw | Heavy-Duty Dry Core Drill Bit for Concrete, Brick & Stone | 3/8" Shank | 2-Inch Deep Cut

Product ID: 119493171

Details

Material
Diamond
Cutting Diameter
2 Inches
Shank Type
Triangle
Brand
DRILAX
Item dimensions L x W x H
2 x 2 x 3

💎Diamond-coated for max durability

⚙️Standard 3/8" shank fits most drills

🛠️2-inch deep cut for heavy-duty tasks

AR$94449

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Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💥 Drill like a pro, last like a legend.

MULTI MATERIAL MASTERY - Effortlessly powers through concrete, granite, marble, and more—your all-in-one masonry solution.
SINTERED DIAMOND COATING - Built to last through concrete, brick, and stone without wear.
PRECISION 2 INCH DRILLING - Clean, exact holes every time—professional-grade results.
HEAVY DUTY DRY CORE PERFORMANCE - Drill dry or wet with unmatched efficiency and versatility.
UNIVERSAL 3 8 SHANK COMPATIBILITY - Seamlessly fits cordless, electric & upright drills for ultimate convenience.

The Drilax 2" Diamond Masonry Hole Saw is a heavy-duty, sintered diamond-coated core drill bit designed for precision drilling up to 2 inches deep. Compatible with standard 3/8" shank drills, it excels in dry or wet conditions and effortlessly cuts through concrete, brick, stone, and other tough masonry materials—making it the go-to tool for professionals and DIYers demanding durability and flawless performance.

Specifications

ASIN	B07L2H6ZKR
Best Sellers Rank	#104,593 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #213 in Hole Saws
Brand	DRILAX
Brand Name	DRILAX
Customer Reviews	4.3 out of 5 stars 750 Reviews
Cutting Angle String	135 degrees
Cutting Diameter	2 inches
Finish Type	Diamond
Finish Types	Diamond
Included Components	Masonry Drill bit for Concrete
Item Dimensions	2 x 2 x 3 inches
Manufacturer	DRILAX
Material	Diamond
Material Type	Diamond
Model	DRILAXHD010050
Number of Flutes	2
Number of Packs	1
Number of Pieces	1
Part Number	DRILAXHD010050
Set Name	Gold Series
Shank Type	Triangle
Surface Recommendation	Concrete
Tool Flute Type	Straight
UPC	850004328019
Unit Count	1 Count

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AR$94449

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered 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 Argentina.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Perfect platform for hard-to-find items. Delivery was prompt.

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