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(ドレメル) コレットセット 4485 【正規品】

Product ID: 738324284

Details

ブランド
Dremel
商品の重量
0.02 ポンド
商品直径
0.13 インチ
対応デバイス
ボール盤
材質
金属

🔧Keyless manual lock for quick changes

🔩Accepts 1/16" shank accessories

⚙️Precision grip for stable rotation

Description

🔧 Upgrade your rotary game with precision and speed!

COMPACT LIGHTWEIGHT - At just 0.3 ounces, it adds zero bulk, keeping your rotary tool agile and ready for any project.
PRECISION ENGINEERING - High-accuracy collet machining ensures a rock-solid grip on your bits, minimizing wobble and maximizing control.
TRUSTED BRAND QUALITY - Made by Dremel, a leader in rotary tools, ensuring durability and performance that pros rely on.
EFFORTLESS BIT CHANGES - Hand-tightened, keyless locking system lets you swap accessories in seconds—no extra tools needed.
UNIVERSAL COMPATIBILITY - Seamlessly works with all Dremel rotary tools and even Bosch models, expanding your toolkit possibilities.

The Dremel 4485 is a precision-engineered, keyless collet designed to hold 1/16" shank accessories securely. Compatible with all Dremel rotary tools and select Bosch models, it offers quick, tool-free bit changes and stable rotation for professional-grade results. Lightweight and crafted from durable plastic, it’s a must-have accessory for expanding your DIY and professional toolkit.

Specifications

ASIN	B0000302Z6
Amazon 売れ筋ランキング	DIY・工具・ガーデン - 52,868位 ( DIY・工具・ガーデンの売れ筋ランキングを見る ) ミニルーター用ドリルチャック - 16位
GTIN (Global Trade Identification Number)	00080596000196
UPC	080596000196
おすすめ度	4.3 5つ星のうち4.3 (7,057) var
ねじ・ボルトの呼び	1/4-20 UNC
ハンドル	手締め
ブランド名	Dremel
メーカー名	ドレメル
メーカー型番	4485
ユニット数	1 セット
ロックタイプ	マニュアル(キーレス)。
付属コンポーネント	コレットナットと4コレット(1/8インチ、3/32インチ、1/16インチ、1/32インチ)。
品目部品番号	4485
商品の入り数	1
商品の重量	0.02 ポンド
商品種別	ドリルチャック
型番	4485
容量	0.13 in
対応アイテム	ボール盤
直径	0.13 インチ
素材	金属

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