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.

Dremel 4485 Quick Change Rotary Tool Collet Nut Set Medium

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Description

⚡ Unlock precision and speed with every twist!

SWIFT ACCESSORY SWAPS - Quick-change collet nut lets you switch bits in seconds—no downtime, just productivity.
COLOR CODED CONVENIENCE - Brown-coded collets simplify accessory selection, so you always grab the right tool for the job.
UNIVERSAL COMPATIBILITY - Works seamlessly with all Dremel corded and cordless rotary tools, maximizing your toolkit’s potential.
TRUSTED USA BASED SUPPORT - Expert customer service ready via chat, email, or phone to keep your projects moving forward.
PRECISION FIT FOR EVERY PROJECT - Four collets cover shank sizes from 1/32" to 1/8", ensuring exact bit compatibility.

The Dremel 4485 Quick Change Rotary Tool Collet Nut Set Medium 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 bit changes and secure clamping, this metal collet set enhances versatility for carving, engraving, cutting, sanding, and grinding tasks, backed by reliable USA-based customer support.

Specifications

ASIN	B0000302Z6
Best Sellers Rank	#10,428 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Router Collets
Brand	Dremel
Brand Name	Dremel
Capacity	0.13 Inches
Compatible Devices	Drilling Machine
Customer Reviews	4.7 out of 5 stars 7,120 Reviews
Global Trade Identification Number	00080596000196
Handle Type	hand-tightened
Included Components	Collet Nut and 4 Collets (1/8", 3/32", 1/16", and 1/32"
Item Diameter	0.13 Inches
Item Part Number	4485
Item Type Name	Quick Change Collet Nut Kit
Item Weight	0.02 Pounds
Lock Type	Manual (keyless)
Manufacturer	Dremel
Manufacturer Part Number	4485
Manufacturer Warranty Description	Warranty
Material	Metal
Material Type	Metal
Model Number	4485
Thread Size	1/8"
UPC	080596000196
Unit Count	1.0 Count

Reviews

V**C

14.04.2026

K**W

10.04.2026

T**N

4.03.2026

C**N

12.03.2025

J**E

29.01.2026

D**Z

27.04.2026

G**L

12.02.2026

A**E

9.01.2026

C**.

12.07.2023

L**A

1.04.2026

A**R

2.11.2025

M**K

18.01.2024

V**Y

29.05.2017

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£13.02

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In stock

Sold byAmazon UKDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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