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

3 4 Boring Bar | Desertcart South Korea

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₩98091

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Elevate your lathe game with precision and power!

TRUSTED BY PROS - Ranked #6 in Turning Inserts, this tool holder is a go-to for professionals demanding precision and reliability.
PRECISION ENGINEERED FIT - 3/4" (20mm) shank diameter ensures seamless integration with your lathe for ultra-precise internal boring.
COMPLETE READY TO USE KIT - Comes with the boring bar, 10 premium inserts, and a wrench—everything you need to upgrade your machining setup instantly.
NEXT LEVEL CUTTING INSERTS - Includes 10 carbide WNMG080408 inserts with TiN coating, delivering superior hardness and low friction for flawless finishing and semi-finishing.
DURABILITY MEETS PERFORMANCE - Crafted from nickel-coated alloy steel, this tool holder offers exceptional toughness and wear resistance for long-lasting use.

The ASZLBYM 3/4" Lathe Internal Boring Bar S20R-MWLNR08 is a high-performance turning tool holder made from nickel-coated alloy steel for enhanced toughness and wear resistance. It includes 10 carbide WNMG080408 inserts coated with TiN for superior hardness and low friction, ideal for finishing and semi-finishing tasks. Designed for professional-grade precision, this kit is a top-ranked choice in industrial turning tools.

Specifications

ASIN	B07Z9XZNX8
Best Sellers Rank	#45,231 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Turning Inserts
Date First Available	October 18, 2019
Item Weight	1.19 pounds
Item model number	S20R-MWLNR08 + WNMG432
Manufacturer	Xuzhou bai yi metal Technology Co., Ltd
Package Dimensions	8.98 x 4.33 x 2.24 inches

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