will this fit my Dremel 3000 rotary drill?

YES, collet nuts are the same size for all Dremels and other brand rotary tools such as Milwaukee.

Can this be used on the Dmel 7300

I am not sure, but I think so. The product description states the ones it does not work with, and the 7300 is not on that list. It fits my Black and Decker, and the various colletts allow for me to use just about any accessory made for any rotary tool, and also twist drill bits. I hope this helps

Will these work in the 4200 with the "EZ Change" system?

I own a basic 2 speed dremel so I can't answer with 100% assurance but my guess is NO. At the very least, the collet "nut" that is supplied will not work on your unit (is in fact replaced by the EZ change system). Also, the dremel website says the EZ402 mandrel is for use with "...exclusive EZ lock accessories.".

regarding the nut's threads, do they begin at the edge, or 1/2" down inside (on the end you screw on with)??

They begin 1/2" down If you are talking about the nut with the female threads.

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🔧 Unlock precision power with every twist!

LIGHTWEIGHT COMPACT - At just 9 grams and pocket-sized, it’s the perfect on-the-go accessory for pros.
DURABLE THREADED DESIGN - 1/4-20 UNC thread size ensures secure attachment and long-lasting reliability.
FUTURE PROOF YOUR TOOLS - Manufacturer improvements keep your set cutting-edge without missing a beat.
SEAMLESS DREMEL INTEGRATION - Works effortlessly with all Dremel rotary tools—upgrade your toolkit instantly.
PRECISION FIT FOR EVERY TASK - Includes four collets (0.03 to 0.13 inch) for exact tool grip and flawless performance.

The Dremel 4485 Collet Set includes four precision collets ranging from 0.03 to 0.13 inches, designed for universal compatibility with all Dremel rotary tools. Featuring a durable 1/4-20 UNC thread size, this lightweight 9-gram set ensures secure, reliable tool performance and easy upgrades for professional-grade results.

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Thread Size	1/4-20 UNC
Capacity	0.13 Inches
Included Components	Collet Nuts and 4 Collets (1/8", 3/32", 1/16", 1/32")
Global Trade Identification Number	00080596000196
Manufacturer	ドレメル
UPC	080596000196
Model Number	4485
Product Dimensions	20.83 x 7.62 x 5.08 cm; 9.07 g
Color	As the picture shows
Name List for Name Plates	Collectible Nut Set
Wallpaper Pattern	Solid
Power Source	Corded Electric
Quantity	1
Are Batteries Included	No
Model Year	2012
Item Weight	9.07 g

Dremel 4485 Collet Set

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