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.

4485

Product ID: 738324284

Details

Brand
Dremel
Compatible Devices
Drilling
Item Diameter
0.13 Inches
Item Weight
0.02 Pounds
Material
Metal

🔩4 precision collet sizes

⚙️Keyless manual lock for quick changes

🛠️Universal fit for all Dremel rotary tools

Description

🔧 Upgrade your rotary game with precision and speed!

DURABLE METAL BUILD - Crafted from high-quality metal for long-lasting performance and reliable grip during high-speed rotations.
EFFORTLESS BIT CHANGES - Hand-tightened, keyless collet nuts let you swap bits in seconds, keeping your workflow smooth and uninterrupted.
SEAMLESS COMPATIBILITY - Works flawlessly with all Dremel rotary tools and even Bosch models—never worry about tool mismatch again.
TRUSTED BY PROS WORLDWIDE - With over 6,900 glowing reviews and a top 10 rank in Compact Router Drill Chucks, join the community that demands precision.
PRECISION FIT FOR EVERY BIT - Includes 4 collets (0.8mm to 3.2mm) to handle your smallest to largest bits with unmatched accuracy.

The Dremel Collet Set 4485 includes four precision-engineered collets (0.8mm, 1.6mm, 2.4mm, 3.2mm) designed for universal compatibility with all Dremel rotary tools and select Bosch models. Featuring a durable metal construction and a keyless, hand-tightened locking system, this set ensures quick bit changes and stable, accurate grip for professional-grade performance.

Specifications

ASIN	B0000302Z6
Amazon Bestseller	#44,573 in DIY, Tools & Garden ( See Top 100 in DIY, Tools & Garden ) #10 in Compact Router Drill Chucks
Brand Name	Dremel
Capacity	0.13 Inches
Compatible Devices	Drilling Machine
Customer Reviews	4.3 4.3 out of 5 stars (6,921)
Global Trade Identification Number	00080596000196
Handle Type	Hand tightened
Included Components	Collet Nuts and 4 Collets (1/8", 3/32", 1/16", 1/32")
Item Diameter	0.13 Inches
Item Part Number	4485
Item Type Name	Drill Chuck
Item Weight	0.02 Pounds
Lock Type	Manual (keyless)
Manufacturer	ドレメル
Manufacturer Part Number	4485
Material Type	Metal
Model Number	4485
Thread Size	1/4-20 UNC
UPC	080596000196
Unit Count	1 Set

Reviews

A**ー

これのおかげでビットのサイズを気にしなくなりました！重宝してます^_^

9.02.2026

ヨ**ナ

ボッシュにも使えるようなので、購入。 ◎ コレットの加工精度良い。 ◯ 軸の咥え込みの安定良い。回転軸物は、精度が出てて、何歩です。ちゃんとしている。お勧めです。

7.12.2025

山**司

手に入らない物だと諦めて改良して使っていましたが､アマゾンさんで本品を手に入れる事が出来て大変助かりました。今までとは比べられないほど作業がはかどりとても嬉しいです。次回も宜しくお願いします。

30.01.2026

ス**ん

ドレメルのルーター一式と同時に購入。このコレットという部品はサイズで色分けされていると探す時選ぶ時に楽なのにと思う。

1.12.2024

あ**あ

細軸の先端工具を使用するのに購入しました。見た目とおり、期待とおりの使える商品でした。

22.12.2025

A**S

リューターのビットのサイズ違いを使いたかったのでこちらを選択確か初期の付属にあった筈だけど、それよりサイズもあるし予備にもなるので購入

20.04.2025

黒**猫

ざまざまな太さのビットが使える様になる。

20.03.2026

A**R

Good collet

Good product. Provides more options for accessories

27.07.2024

C**.

Arrived on time. Very nice.

12.07.2023

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

O**Z

Buen producto

21.06.2025

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