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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Description

🔧 Upgrade your rotary game with precision and speed!

SPEED MEETS EFFICIENCY - Quick-change collet nut lets you switch accessories in seconds—no downtime, just productivity.
COLOR CODED CONVENIENCE - Brown-coded collets simplify accessory matching, so you’re always using the right tool for the job.
UNIVERSAL COMPATIBILITY - Works seamlessly with all Dremel cordless and corded rotary tools, ensuring no tool left behind.
PRECISION FIT EVERY TIME - Includes four collets (1/8", 3/32", 1/16", 1/32") for versatile bit compatibility.
TRUSTED SUPPORT USA BASED - Access expert customer service via chat, email, phone, or in-person at Racine, WI—because your projects deserve the best.

The Dremel 4485 Quick Change Rotary Tool Collet Nut Set Medium is a 5-piece accessory kit featuring four precision collets and a quick-change nut, compatible with all Dremel rotary tools. Designed for fast bit swaps and versatile use, it supports bit sizes from 1/32" to 1/8" and includes color-coded collets for easy identification. Backed by USA-based customer service, this set ensures professional-grade performance and convenience for every project.

Specifications

Thread Size	1/8"
Capacity	0.13 Inches
Included Components	Collet Nut and 4 Collets (1/8", 3/32", 1/16", and 1/32"
Global Trade Identification Number	00080596000196
Manufacturer	Dremel
UPC	080596000196
Part Number	4485
Item Weight	0.32 ounces
Product Dimensions	8.2 x 3 x 2 inches
Item model number	4485
Is Discontinued By Manufacturer	No
Size	Medium
Color	As the Picture Shown
Style	Collect Nut Set
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Power Source	Battery Powered
Item Package Quantity	1
Number Of Pieces	1
Cutting Diameter	0.13 Inches
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No
Warranty Description	Warranty
National Stock Number	5180-01-480-4879

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