Do they have a hex shank?

So I am not sure of the brand as the box does not give that information but mine were 32mm and had 3 flats ground into a round shaft, perfect for very positive attachment to a drill chuck. I use them dry to drill conduit holes in cement blocks. They work great though they are a little shallow so I chipped out the core to go deeper.

Is the circle that remains after drilling still usable? I need to be able to use the circles. Thanks!

I was drilling into wine bottles.

What is the warranty on these bits?

No warranty. Because the masonry hole saw is a one-time drilling tool and doesn't provide warranty service. On the other way, it is recommended to add water during the drilling process, to extend the life of diamond hole saw.

JINGLING 2Pcs 20mm 3/4" inch Diamond Hole Saws Granite Drill Bits Masonry Tools for Stone

Product ID: 97752717

Details

Material
High Carbon
Cutting Diameter
20 Millimeters
Finish Type
Diamond
Shank Type
hex
Cutting Angle String
45 Degrees

💧Water-cooled

🔩20mm OD

🛠️5/16" hex shank

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€ 17.36

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Material
High Carbon
Cutting Diameter
20 Millimeters
Finish Type
Diamond

Description

🔧 Drill Like a Pro—Unleash Your Inner Craftsman!

USER FRIENDLY DESIGN - No pilot drill needed; simply attach to your drill and start creating.
CLEAN CUTS EVERY TIME - Experience minimal cleanup with precision cutting that requires no further work.
PRECISION ENGINEERING - Achieve flawless cuts with a 20mm outer diameter for perfect hole sizes.
VERSATILE APPLICATIONS - Ideal for granite, marble, tile, and glass—your go-to tool for all stone projects.
EFFICIENT COOLING SYSTEM - Add water for a smooth drilling experience and to prolong bit life.

The JINGLING 2Pcs 20mm Diamond Hole Saws are expertly designed for cutting through tough materials like granite, marble, and glass. With a 20mm outer diameter and a 5/16 inch hex shank, these drill bits ensure clean, precise holes without the need for a pilot drill. Ideal for both professional and DIY projects, they require water for cooling, making them efficient and easy to use.

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