How well does the DW4765 work in dry cutting slate (not porcelain)?

This blade will cut slate with no issues, provided you don't let the blade overheat. I.e. pour cold water occasionally to keep it cool; cut small sections at a time. Guessing you will be cutting long, thick sections of slate.

Can I use the dewalt 20v 4 1/2 circular saw

Yes it will work with any 4 1/2 inch circular saw.

what is the copper washer/shim which comes with the blade for ?

The washer is used if you have a smaller arbor on the grinder.

Compatible with bosch gsw 9-125 grinder ?

Compatibility simply depends on the arbor size. The package should include a 5/8" or 7/8" arbor adapter. Thus, if your Bosch matches either of these sizes, you're "good to go".

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DEWALT Diamond Blade for Porcelain Tile, Wet/Dry, 4-1/2-Inch (DW4765)

Product ID: 6594372

Details

Brand
DEWALT
Color
Multi
Compatible Devices
DEWALT tile
Global Trade Identification Number
Material
Blend
Number of Items
1

💎High diamond concentration for ultra-fast cuts

🔥Steel core resists heat distortion

⚙️Tensioned blade core minimizes vibration

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MOP$553

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Description

💎 Cut like a pro, last like a legend.

UNMATCHED DURABILITY - Premium diamond matrix delivers up to 4x the lifespan of standard blades—cut more, replace less.
VERSATILE WET DRY USE - Optimized for both wet and dry cutting, adapting seamlessly to your project needs.
SMOOTH STABLE OPERATION - Tensioned blade core reduces wobble and vibration for professional-grade accuracy.
HEAT RESISTANT PERFORMANCE - High-quality steel core and laser-cut expansion slots prevent warping under intense workloads.
PRECISION CHIP FREE CUTTING - Continuous rim design ensures flawless porcelain tile edges every time.

The DEWALT DW4765 4-1/2-Inch Diamond Blade is engineered for porcelain tile cutting with a high diamond concentration and a tensioned steel core that resists heat and vibration. Its continuous rim design guarantees chip-free, precise cuts whether wet or dry, while the premium diamond matrix extends blade life up to 4 times longer than standard blades—making it the go-to choice for professionals demanding speed, durability, and flawless results.

Specifications

ASIN	B001M0GBOG
Best Sellers Rank	#118,120 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #173 in Diamond Saw Blades
Brand Name	DEWALT
Color	Multi
Compatible Devices	DEWALT tile saws, other high power tile saws
Compatible Material	Porcelain
Customer Reviews	4.8 4.8 out of 5 stars (624)
Global Trade Identification Number	00028877560106
Included Components	Dewalt - DW4765
Item Dimensions L x W	4.5"L x 4.5"W
Item Type Name	Dewalt - DW4765
Manufacturer	DEWALT
Material Type	Blend
Model	DW4765
Part Number	DW4765
Style Name	Classic
UPC	028877560106
Unit Count	1.0 Count

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