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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Dremel 4485 Quick Change Rotary Tool Collet Nut Set Medium

Product ID: 283262404

Details

Brand
Dremel
Compatible devices
Drilling
Item diameter
0.13 Inches
Item weight
9 g
Material
Metal

⚡Quick-change collet nut for fast swaps

🔩5-piece precision collet set

🛠️Compatible with all Dremel rotary tools

€ 40.04

Duties & taxes included

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Description

🔧 Upgrade your Dremel game—precision, speed, and versatility in one quick-change kit!

SPEED UP YOUR WORKFLOW - Quick-change collet nut lets you swap accessories in seconds—no downtime, just productivity.
COLOR CODED CONVENIENCE - Brown-coded collets simplify accessory selection, so you never waste time guessing.
UNIVERSAL COMPATIBILITY - Works seamlessly with all Dremel corded and cordless rotary tools—one set, endless possibilities.
PRECISION FIT EVERY TIME - Four collet sizes (0.8mm to 3.2mm) ensure perfect bit grip for flawless results.
TRUSTED SUPPORT USA BASED - Access expert help anytime via chat, email, or phone from Dremel’s Racine, WI service center.

The Dremel 4485 Quick Change Rotary Tool Collet Nut Set includes a quick-change collet nut and four precision collets (0.8mm, 1.6mm, 2.4mm, 3.2mm) compatible with all Dremel rotary tools. Designed for fast accessory swaps and secure bit clamping, this metal set enhances your tool’s versatility for carving, engraving, cutting, sanding, and grinding. Backed by USA-based customer service, it’s a must-have for professionals and DIYers seeking flawless performance.

Specifications

ASIN	B0000302Z6
ASIN	B0000302Z6
Best Sellers Rank	#27,252 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #8 in Router Collets
Brand Name	Dremel
Capacity	0.13 inches
Compatible Devices	Drilling Machine
Customer Reviews	4.7 4.7 out of 5 stars (6,965)
Customer reviews	4.7 4.7 out of 5 stars (6,965)
Date First Available	1 January 2024
Department	Unisex-Adult
Global Trade Identification Number	00080596000196
Handle Type	Hand-tightened
Included Components	Quick-change collet nut and 4 collets (1/8 inch, 3/32 1/16 1/32 inch)
Is Discontinued By Manufacturer	No
Item Diameter	0.13 Inches
Item Part Number	4485
Item Type Name	Quick Change Collet Nut Kit
Item Weight	9 g
Item model number	4485
Lock Type	Manual
Manufacturer	Dremel
Manufacturer	Dremel
Manufacturer Part Number	4485
Material Type	Metal
Model Number	4485
Number of Items	1
Product Dimensions	20.83 x 7.62 x 5.08 cm; 9.07 g
Thread Size	1/8"
UPC	080596000196
Unit Count	1 Count

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