how many are in the package?

25 per box, clearly stated in the heading!

They say dry enviornment? Can these be used to secure a gazebo to a concrete pad?

I would say yes because it's not constantly wet. If the concrete is wet most of the time it can get flaky and not hold tight.

Can this be used to attach an a/c mini-split wall mount brackets to stucco?

These are perfect for any cement or stucco surface.

what size bosch concrete SDS drill bit is needed to use with these concrete screws?

3/8 inch drill size. The bolt shaft is a hair under 3/8 inch an the thread diameter is about 7/16ths You will need a 3/8 inch ratchet wrench to torque these in. I used a power driver and snapped the adapter bit. The holding power is amazing.

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CONFASTLDC383 3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box)

Product ID: 404806117

Details

Material
Carbon Steel
Drive System
External Hex
Head Style
Hex
Exterior Finish
Zinc Steel
Point Style
Hex Washer

$207.54

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Material
Carbon Steel
Drive System
External Hex
Head Style
Hex

Description

CONFASTLDC383 3/8" x 3" Zinc Plated Large Diameter Concrete Screw for Anchoring to Masonry, Brick or Block (25 per Box)

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