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 swap accessories in seconds—no downtime, just productivity.
COLOR CODED CONVENIENCE - Brown-coded collets simplify accessory matching, so you always grab the right tool for the job.
UNIVERSAL COMPATIBILITY - Works seamlessly with all Dremel corded and cordless rotary tools, ensuring no tool left behind.
PRECISION FIT EVERY TIME - Securely clamp bits with 4 collets ranging from 0.8mm to 3.2mm for versatile projects.
TRUSTED SUPPORT USA BASED - Access expert customer service via chat, email, or phone from Racine, WI—because your craft deserves the best.

The Dremel 4485 Quick Change Rotary Tool Collet Nut Set Medium includes a quick-change collet nut and four precision collets (0.8mm to 3.2mm) compatible with all Dremel rotary tools. Designed for fast accessory swaps and secure bit clamping, this 5-piece set enhances versatility and efficiency for professional and DIY projects alike.

Specifications

Thread size	1/4-20 UNC
Capacity	0.13 Inches
Included components	Quick-change collet nut and 4 collets (1/8 inch, 3/32 1/16 1/32 inch)
Global Trade Identification Number	00080596000196
Manufacturer	Dremel
UPC	080596000196
Part number	4485
Item Weight	9.07 g
Product Dimensions	20.83 x 7.62 x 5.08 cm; 9.07 g
Item model number	4485
Size	Medium
Color	As the Picture Shown
Style	Collect Nut Set
Finish	Brushed
Pattern	Solid
Shape	Rectangular
Power source type	corded-electric
Item Package Quantity	1
Number Of Pieces	1
Cutting Diameter	0.13 Inches
Measurement System	Metric
Batteries Included?	No
Batteries Required?	No

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