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 toolkit with lightning-fast precision!

SWIFT TOOL SWAPS - Quick change collet nut design minimizes downtime and maximizes productivity.
COMPACT LIGHTWEIGHT - Weighing just 9 grams, it’s easy to handle without adding bulk.
TRUSTED BRAND QUALITY - From Dremel, a name synonymous with professional-grade tool accessories.
ENGINEERED FOR ENDURANCE - Robust metal build guarantees long-lasting performance under heavy use.
PRECISION FIT FOR EVERY PROJECT - 0.13-inch capacity ensures exact tool compatibility for flawless results.

The Dremel 4485 Quick Change Collet Nut is a precision-engineered tool accessory with a 0.13-inch capacity, designed for rapid bit changes and durable performance. Lightweight and compact, it’s an essential upgrade for professionals seeking efficiency and reliability in their rotary tool setups.

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Capacity	0.13 inches
Global Trade Identification Number	00080596000196
Manufacturer	Dremel Mfg Co
UPC	080596000196
Part Number	4485
Product Dimensions	20.83 x 7.62 x 5.08 cm; 9.07 g
Item model number	4485
Colour	Silver
Item Package Quantity	1
Number of Pieces	1
Batteries included?	No
Batteries Required?	No
Item Weight	9.07 g

Dremel 4485 Quick Change Collet Nut

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