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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🔧 Upgrade your rotary game with precision that fits like a glove!

QUICK SWAP EFFICIENCY - Easily change collets to match your project demands and keep momentum going.
TRUSTED BRAND QUALITY - From Dremel, the name pros rely on for precision and reliability.
SEAMLESS COMPATIBILITY - Works flawlessly with all Dremel rotary tools—no adapters needed.
PRECISION FIT FOR EVERY TASK - Four collet sizes (0.03 to 0.13 in) ensure perfect grip on all your rotary bits.
DURABLE BUILD LIGHTWEIGHT FEEL - Engineered for strength at just 9 grams, so your tool stays nimble.

The Dremel 4485 Collet Set includes four precision collets (0.03 to 0.13 inches) with a universal 1/4-20 UNC thread size, compatible with all Dremel rotary tools. Lightweight at just 9 grams, this set offers durable, easy-to-swap components designed to enhance your tool’s versatility and performance.

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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
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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