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

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

🔧Compatible with all Dremel rotary tools

⚙️5-piece precision collet set

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5163 som

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In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡️ Upgrade your rotary game with precision and speed!

SWIFT ACCESSORY SWAPS - Quick-change collet nut lets you switch bits in seconds, minimizing downtime.
COLOR CODED CONVENIENCE - Brown-coded collets simplify accessory selection for your projects.
TRUSTED USA BASED SUPPORT - Reliable customer service ready to assist via chat, email, or phone.
PRECISION FIT FOR EVERY BIT - Includes four collets (0.8mm to 3.2mm) for versatile accessory compatibility.
UNIVERSAL DREMEL COMPATIBILITY - Works seamlessly with all corded and cordless Dremel rotary tools.

The Dremel 4485 Quick Change Rotary Tool Collet Nut Set is a 5-piece metal kit featuring four collets ranging from 0.8mm to 3.2mm and a quick-change collet nut. Designed for all Dremel rotary tools, it ensures secure, fast accessory swaps and enhanced versatility for carving, engraving, cutting, sanding, and grinding projects. Backed by USA-based customer support, this set is a must-have for professionals seeking precision and efficiency.

Specifications

ASIN	B0000302Z6
ASIN	B0000302Z6
Best Sellers Rank	#80,192 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #18 in Router Collets
Brand Name	Dremel
Capacity	0.13 Inches
Compatible Devices	Drilling Machine
Customer Reviews	4.7 4.7 out of 5 stars (6,868)
Customer reviews	4.7 4.7 out of 5 stars (6,868)
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
Product Dimensions	20.83 x 7.62 x 5.08 cm; 9.07 g
Thread Size	1/8"
UPC	080596000196
Unit Count	1 Count

Reviews

C**.

Arrived on time. Very nice.

12.07.2023

L**A

Perfect

1.04.2026

A**R

This fitted my Dremmel which is a very early model

2.11.2025

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

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5163 som

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