What are the blade specs? We know its 4.5" but what is the center hole size?

The arbor hole is 3/8" which makes the blades harder to find at the local hardware store. There is no adapter included, but also note that Dewalt clearly states not to use abrasive blades as that could overheat the motor.

What are the main differences between this and let's say the 7 1/4 inch circular saw? The cut depths are not that different.

It barely cuts through 2x lumber (1-9/16) that's only a 1/16 over the depth of 2x lumber, so I don't use it for that, personally. It's a wonderful "grab and go" saw for 1x material and sheet goods. I'm a homeowner weekend warrior user, so I'm not using it daily. But, so far it's cut through everything well and you can easily use it with one hand. I also have the 7-1/4 saw and use it when I cut 2x material as it will cut 1 inch deeper.

What's the part number for a compatible dust bag?

A dust port is included to connect to a vacuum. The port part number is N594300

can i use the dewalt battery from my cordless drill to power this saw?

Yes, if the battery of your cordless drill is 20v also. Batteries of all 20v tools, I believe, can be used to power any other 20v cordless tools.

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Description

⚡ Cut smarter, not harder — the compact power tool for pros on the move!

COMPACT CONTROL - Removable auxiliary handle and 1-1/2 in. finger trigger provide ergonomic grip options for ultimate control on the job.
CUT MORE CHARGE LESS - Capable of slicing through 369 linear feet of 3/4 in. OSB on a single DCB205 battery charge (battery sold separately).
POWER MEETS PRECISION - Brushless motor delivers longer runtime and peak performance for demanding cuts.
SAFETY CONVENIENCE BUILT IN - Electronic blade brake stops the blade instantly, while on-board blade key storage and dust port keep your workflow seamless.
VERSATILE ANGLES FLAWLESS FINISH - Bevel lever and gear enable smooth 45° and 90° cuts on 1x and 2x lumber, perfect for professional-grade projects.

The DEWALT ATOMIC 20V MAX* 4-1/2-Inch Circular Saw combines brushless motor technology with a compact design, delivering up to 369 linear feet of cutting power per battery charge. Featuring bevel capabilities for 45° and 90° cuts, an electronic blade brake for safety, and ergonomic controls, this tool is engineered for precision, efficiency, and convenience on any job site.

Specifications

Brand	DEWALT
Color	Black
Blade Material	High Speed Steel
Surface Recommendation	Wood
Power Source	Battery Powered
Special Feature	Brake, Brushless
Included Components	(1) DCS571 20V MAX* Brushless 4-1/2 in. Circular Saw; (1) Wood cutting blade; (1) Blade change key; (1) Dust port adaptor; (1) Rip fence
Product Dimensions	17.88"L x 5.13"W x 6.69"H
Voltage	20 Volts
Warranty Type	Limited Warranty
Item Weight	5.5 Pounds
Blade Length	2 Inches
Number of Teeth	24
Number of Batteries	1 Lithium Ion batteries required.
Cutting Angle	90 Degrees
Specification Met	CSA
Blade Shape	Rectangular
Global Trade Identification Number	00885911592239
Handle Material	Plastic
UPC	885911592239
Manufacturer	DEWALT
Part Number	DCS571B
Item Weight	5.5 pounds
Item model number	DCS571B
Batteries	1 Lithium Ion batteries required.
Is Discontinued By Manufacturer	No
Size	One Size
Style	Classic
Finish	Brushed
Material	Metal
Pattern	Solid
Shape	Rectangular
Item Package Quantity	1
Special Features	Brake, Brushless
Batteries Included?	No
Batteries Required?	Yes

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