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!

USER CENTRIC DESIGN - Removable auxiliary handle and 1-1/2 in. finger trigger provide enhanced 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.
CUT MORE CHARGE LESS - Achieve up to 369 linear feet of 3/4 in. OSB cuts on a single DCB205 battery charge.
POWER MEETS PRECISION - Brushless motor delivers longer runtime and peak performance for demanding cuts.
VERSATILE BEVEL CAPABILITY - Easily bevel up to 45° for 1x lumber and 90° for 2x material with the innovative bevel gear design.

The DEWALT ATOMIC 20V MAX* 4-1/2-Inch Circular Saw (DCS571B) is a compact, brushless cordless tool designed for professional-grade wood cutting. Compatible with 20V MAX* batteries, it delivers up to 369 linear feet of cutting on a single charge, features bevel gear technology for versatile angle cuts, and includes safety and ergonomic enhancements like an electronic blade brake, auxiliary handle, and dust port for a clean, controlled cutting experience.

Specifications

Brand	DEWALT
Colour	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	45.4L x 13W x 17H Centimeters
Voltage	20 Volts
Item Weight	2.5 kg
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
Blade Shape	Round
Global Trade Identification Number	00885911592239
Handle Material	Plastic
UPC	885911592239
Department	Unisex-Adult
Manufacturer	DEWALT
Item model number	DCS571B
ASIN	B07VYLSYQ6

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