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 — power and precision in your hands!

VERSATILE ANGLES - Bevel lever and gear enable precise bevel cuts up to 45°, perfect for 1x and 2x lumber applications.
ERGONOMIC CONTROL - Removable auxiliary handle and 1-1/2 in. finger trigger let you maintain ultimate control and comfort during extended use.
SAFETY CONVENIENCE - Electronic blade brake stops the blade instantly, plus on-board blade key storage and dust port keep your workflow smooth and clean.
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 power for demanding cuts.

The DEWALT ATOMIC 20V MAX* 4-1/2-Inch Circular Saw (DCS571B) is a compact, brushless battery-powered tool designed for professional-grade wood cutting. It offers up to 369 linear feet of cutting per charge, versatile bevel capabilities up to 45°, and enhanced user control with an auxiliary handle and finger trigger. Safety features include an electronic blade brake and convenient on-board storage for blade keys and dust management accessories.

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	6.6 Pounds
Blade Length	2 Inches
Number of Teeth	24
Number of Batteries	1 Lithium Ion batteries required.
Cutting Angle	90 Degrees
Specification Met	[Inferred] Yes, meets certain specifications in its category
Global Trade Identification Number	00885911592239
UPC	885911592239
Manufacturer	DEWALT
Part Number	DCS571B
Item Weight	6.6 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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