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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4485 Quick Change Rotary Tool Collet Nut Set Medium

Product ID: 1771704

Details

Brand
Dremel
Compatible Devices
Drilling
Item Diameter
0.13 Inches
Item Weight
9.07 g
Material
Metal

🔄Quick-change collet nut

⚙️4 precision collets (0.8-3.2mm)

🛠️Universal Dremel compatibility

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R$192

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Sold byAmazon BrazilDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Upgrade your rotary game with precision & speed!

TRUSTED USA SUPPORT - Backed by dedicated customer service based in Racine, WI for peace of mind.
SWIFT ACCESSORY SWAPS - Quick-change collet nut lets you switch bits in seconds—no tools needed.
SEAMLESS COMPATIBILITY - Works flawlessly with all Dremel corded and cordless rotary tools.
COLOR CODED CONVENIENCE - Brown-coded collets simplify accessory selection and project flow.
PRECISION FIT FOR EVERY BIT - Four collets cover shanks from 1/32" to 1/8" for ultimate versatility.

The Dremel 4485 Quick Change Rotary Tool Collet Nut Set 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 swaps and secure clamping, this metal collet set enhances tool versatility for carving, engraving, cutting, sanding, and grinding projects, supported by USA-based customer service.

Specifications

ASIN	B0000302Z6
Best Sellers Rank	#14,295 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1 in Router Collets
Brand Name	Dremel
Capacity	0.13 Inches
Compatible Devices	Drilling Machine
Customer Reviews	4.7 4.7 out of 5 stars (7,162)
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	9.07 g
Lock Type	Manual (keyless)
Manufacturer	Dremel
Manufacturer Part Number	4485
Manufacturer Warranty Description	Warranty
Material Type	Metal
Model Number	4485
Thread Size	1/8"
UPC	080596000196
Unit Count	1.0 Count

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