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 Dremel game with quick-change precision!

TRUSTED BY THOUSANDS - Rated 4.7 stars by over 6,700 users—join the community of pros who rely on Dremel precision.
COMPACT LIGHTWEIGHT - At just 9 grams, it’s easy to handle without adding bulk to your toolkit.
EFFORTLESS QUICK CHANGE - Hand-tightened collet nut design for fast, tool-free accessory swaps that keep you in flow.
DURABLE METAL CONSTRUCTION - Built to last with premium metal materials ensuring long-term reliability on every project.
PRECISION FIT FOR EARLY MODERN DREMELS - Seamlessly compatible with a wide range of Dremel models, including vintage tools.

The Dremel 4485 Quick Change Collet Nut is a durable, hand-tightened metal chuck accessory with a 0.13-inch capacity and 1/4-20 UNC thread size, compatible with early and modern Dremel models. Lightweight and highly rated, it enables fast accessory swaps for efficient DIY and professional use.

Specifications

ASIN	B0000302Z6
Best Sellers Rank	59,865 in DIY & Tools ( See Top 100 in DIY & Tools ) 5,771 in Power Tool Accessories
Brand	Dremel
Capacity	0.13 inches
Compatible Devices	Drilling Machine
Country of Origin	Mexico
Customer Reviews	4.7 4.7 out of 5 stars (6,800)
Global Trade Identification Number	00080596000196
Handle Type	Hand-tightened
Item Diameter	0.13 Inches
Item Part Number	4485
Item Weight	0.02 Pounds
Lock Type	Manual
Manufacturer	Dremel Mfg Co
Material	Metal
Model Number	4485
Part Number	4485
Thread Size	1/4-20 UNC
UPC	080596000196
Unit Count	1.0 count

Reviews

A**R

Replacement dremmel collet

This fitted my Dremmel which is a very early model

2.11.2025

C**8

good

very good

14.07.2019

R**R

Five Stars

great price

1.08.2015

L**A

Perfect

1.04.2026

T**N

Perfect replacement for my existing that broke and nice to have some spares.

4.03.2026

M**K

Happy

18.01.2024

V**Y

Found an original Dremel product...fits perfectly...though it took some time to deliver the product overall happy with the results.

29.05.2017

O**Z

Buen producto

21.06.2025

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