Will this blade cut cast iron pipe?

it will cut steel but it will wear it out very fast . i am a mason and cut rebar with these blades all the time . not sure about cast iron but softer steel they will cut although they are not intended to be used for that

Will this fit a DeWalt model D28402W?

Yes, you can use this with the DW402 but you need to get the DW4706 Backing Flange. Amazon sells it for $2.99 as an add-on item. You need this flange for any type 1 cutting wheel used on a type 72 grinder (cupped surface disks). BTW, the arbor is 7/8" for disks that don't screw on, and 5/8" threads for those that do screw on. Hence you need cutting disks, like this one, with a 7/8" arbor. This applies for all grinders, not just Dewalt.

Will this fit the cordless dewalt 4 1/2 dcg412? thanks

It will fit any 4 1/2". Cord or no cord is irrelevant.

Will this grid carbide bits?

This a Diamond Saw Blade, its used to cut tile, brick, concrete, Masonry type work. Not intended for cutting metal. I cut tile and concrete with mine.

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DEWALT Diamond Blade for Masonry, Dry Cutting, Continuous Rim, 7/8-Inch Arbor, 4-1/2-Inch (DW4725)

Product ID: 3979999

Details

Brand
DEWALT
Color
Multi
Compatible Devices
Saws with and
Item Weight
4.16 ounces
Material
Blend
Number of Items
1

⚡Thinner kerf for faster cuts

💎200x longer life

🛠️7/8-inch arbor fit

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Description

💎 Cut smarter, not harder—experience the diamond difference!

UNMATCHED DURABILITY - Lasts 200 times longer than conventional blades—cut more, replace less.
SPEED MEETS PRECISION - Thinner kerf design accelerates cuts while minimizing dust for a cleaner workspace.
DRY CUTTING EFFICIENCY - Optimized for dry cutting masonry—ditch the water mess without sacrificing performance.
SEAMLESS COMPATIBILITY - Fits standard 7/8-inch arbor grinders for effortless installation and stability.
SMOOTH CHIP FREE EDGES - Continuous rim ensures professional-grade, clean cuts every time.

The DEWALT DW4725 4-1/2-Inch High Performance Diamond Blade is engineered for masonry professionals and serious DIYers seeking precision and longevity. Featuring a high-performance diamond matrix that lasts 200 times longer than traditional abrasives, a thinner kerf for faster, cleaner cuts, and a continuous rim design for smooth edges, this blade excels in dry cutting applications. Compatible with standard 7/8-inch arbor grinders, it delivers stable, chip-free performance on block, brick, concrete, and other masonry materials—making it a must-have for efficient, dust-minimized cutting.

Specifications

ASIN	B0002Q8TIC
Best Sellers Rank	#4,209 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in Diamond Saw Blades
Brand Name	DEWALT
Color	Multi
Compatible Devices	Saws with 7/8-inch arbor and dry cutting capability
Compatible Material	Granite, Marble, Concrete
Customer Reviews	4.7 4.7 out of 5 stars (8,358)
Global Trade Identification Number	00028877328881
Included Components	DW4725 - 4-1/2 in. High Performance Diamond Masonry Blade
Item Dimensions L x W	4.5"L x 4.5"W
Item Type Name	4-1/2IN HIGH PERF MASONRY BLADE CARDED
Item Weight	4.16 ounces
Manufacturer	DEWALT
Material Type	Blend
Model	DW4725
Part Number	DW4725
Set Name	Single
Style Name	Modern
UPC	028877328881
Unit Count	1.0 Count

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