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 Lathe Internal Boring Bar Turning Tool Holder S20r

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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₩116361

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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!

ADVANCED CARBIDE INSERTS - Includes 10 indexable WNMG080408 carbide inserts coated with TiN, offering superior hardness, low friction, and chemical stability for ultra-precise finishing.
PRECISION ENGINEERED FIT - 3/4" (20mm) shank diameter ensures seamless integration with your lathe setup for flawless internal boring.
COMPLETE PROFESSIONAL KIT - Package includes the S20R-MWLNR08 boring bar, 10 premium CNC inserts, and a wrench—everything you need to upgrade your machining workflow instantly.
DURABLE ALLOY STEEL CONSTRUCTION - Crafted from high-quality alloy steel with a nickel coating, delivering exceptional toughness and wear resistance for long-lasting performance.
OPTIMIZED FOR HIGH PRECISION TURNING - Designed for finishing and semi-finishing tasks, this tool holder supports high-precision cutting, milling, drilling, grooving, and threading applications.

The 3/4" Lathe Internal Boring Bar S20R-MWLNR08 with WNMG432 indexable carbide inserts is a professional-grade turning tool designed for high-precision internal boring. Made from nickel-coated alloy steel for durability and paired with TiN-coated carbide inserts, it offers superior wear resistance and accuracy. This complete kit is ideal for finishing and semi-finishing operations, making it a must-have for millennial managers seeking reliable, efficient machining tools that keep their workshop ahead of the curve.

Specifications

ASIN	B07Z9XZNX8
Best Sellers Rank	#51,332 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 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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