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.

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

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Details

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

🔩3/8 inch shank

🧱2 inch diameter

⚒️Extra long depth

Description

🔧 Drill Like a Pro: Elevate Your DIY Game!

DURABLE DESIGN - Built to withstand the rigors of heavy-duty projects.
PRECISION AT ITS BEST - Achieve accurate holes every time with diamond-tipped technology.
UNMATCHED VERSATILITY - Drill through concrete, brick, and cinder block with ease.
HEAVY DUTY PERFORMANCE - Engineered for precision drilling in tough materials.
EFFICIENT CORE DRILLING - Maximize your productivity with extra long depth of cut.

The Drilax 2 Inch Masonry Hole Saw is a heavy-duty diamond drill bit designed for precision drilling in concrete, brick, and cinder block. Featuring a 3/8 inch shank and an extra long depth of cut, this versatile tool is perfect for both professional and DIY projects, ensuring durability and efficiency in every use.

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