Can this be used in a boring bar holder on a milling machine, or is it only for a lathe?

If you are asking if it can be used in a boring head the answer is no. As this is a right-hand boring bar and you would have to run the machine in reverse to get it to cut. If you ran it in reverse without some sort of mod to the boring head the head would unscrew from the shank as soon as you began to cut causing a spectacular crash. You need a left-hand bar. With that you can run in forward with no worries.

is this actually a 3/4" or a 20mm, i need a 3/4.

3/4'' is the size of the shank itself. I don't think it would be a mm bigger as most common lathe/mill tools are inch instead of mm

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⚙️ Elevate Your Lathe Game with Precision & Power!

COMPLETE READY TO USE KIT - Includes 1 boring bar, 10 carbide inserts, and a wrench—everything you need to upgrade your turning game right out of the box.
CUTTING EDGE CARBIDE TECH - TiN-coated WNMG432 carbide inserts deliver exceptional hardness and low friction, ideal for smooth finishing and semi-finishing on steel.
SMART STORAGE SMART WORKFLOW - Packaged in durable plastic containers to keep your inserts safe, organized, and ready for action—because downtime is the enemy of productivity.
BUILT TO LAST DESIGNED TO PERFORM - Nickel coating on high-quality alloy steel boosts corrosion and wear resistance, so your tool stays sharp and reliable over countless projects.
PRECISION ENGINEERING FOR MILLENNIAL MAKERS - 3/4" shank diameter ensures a perfect, stable fit for your lathe setup, minimizing vibration and maximizing accuracy.

The ASZLBYM S20R-MWLNR08 Lathe Internal Boring Bar with WNMG432 carbide inserts is a professional-grade turning tool designed for precision and durability. Featuring a 3/4" nickel-coated alloy steel shank and TiN-coated carbide inserts, it offers superior wear resistance and cutting performance for finishing and semi-finishing steel. This complete kit includes 10 inserts and a wrench, all neatly packaged for easy storage and immediate use.

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€ 112.42

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Manufacturer	Xuzhou bai yi metal Technology Co., Ltd
Part number	S20R-MWLNR08 + WNMG432
Item Weight	590 g
Package Dimensions	22.35 x 6.86 x 4.06 cm; 590 g
Item model number	S20R-MWLNR08 + WNMG432
Colour	Silver + yellow
Material	Holder：alloy steel , Insert ：carbide
Item Package Quantity	1
Measurement System	Inch
Batteries included?	No
Batteries Required?	No

ASZLBYM 3/4" Lathe Internal Boring Bar Turning Tool Holder S20R-MWLNR08 with Indexable Carbide Turning Insert WNMG432

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