Grizzly H8307 - Internal Threading Boring Bar - 1

Grizzly H8307 - Internal Threading Boring Bar - 1" Shank, Right-hand

Marsoni

M251S

$114.20

Get it in 3 business days with 1 day shipping. Friday, May 29

Grizzly H8307 - Internal Threading Boring Bar - 1" Shank, Right-handH8307 1" Shank, Right Hand Internal Threading Boring Bar Boring bars made to exacting specifications for rigidity and reach. The H8307 Boring Bars have flats which, hold the tool in a negative position. Dont worry, the inserts we carry have more than enough rake to move chips fast and efficiently! The insert pockets are cut for a tight fit and the 60 cutter profile is fully supported. Inserts are not included. The H8351 Carbide Inserts for steel,

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Exchange/Return Notes

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After a month experimenting with my new Breville Barista Express, I finally decided that a few of the basic accessories actually would make a difference in my coffee, so I got this as well as a distributor tool, and there is a noticeable difference. I consistently get excellent extractions, where before, I would occasionally get a shot that clearly was not distributed and tamped properly. The price for these tools was combined, less than $30 and most definitely worth it!

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Reviewed in the United States on January 4, 2026

Verified Purchase

Bethany Clark

Belleville, US

★★★★★ 4

Great to use, little difficult to put away

Color: Matte Black

It's a perfect wdt tool and works wonderfully for it's entended purpose. Great weight to it and the base, however the base to store it is very slim, making it difficult to replace once done.

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Reviewed in the United States on January 2, 2025

Verified Purchase

Lace

West Palm Beach, US

★★★★★ 5

Good

Color: Matte Black

This is used nearly daily, it’s been about a month, and I haven’t noticed the needles falling out. I didn’t research if these needles were the right size for perfectly distributed coffee, but it breaks up my clumps very easily and efficiently. I made a lot of changes for my new espresso machine that have improved my coffee, and I would guess this would definitely be one of them. If you buy a WDT tool, I did my research and I can’t complain about this one that I bought. It even came with replacement needles. Would buy again. It feels nice, and I even wipe the needles after each use with a wet and then dry towel, and they still stay in place. You can bend them if you want them angled or straight.

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Reviewed in the United States on March 11, 2024

Verified Purchase

Roy

Belleville, US

★★★★★ 5

Works well

Color: Matte Brown

I bought these for my Flair Pro 3. It does help declump as expected.

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Reviewed in the United States on December 31, 2025

Verified Purchase

Dave King

Draper, US

★★★★★ 5

Wish I had one before

Color: Matte Black

Nice little tool. I never used one before and it does make a difference when evenly distributing the grounds and taking any clumps out. Would recommend.

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Reviewed in the United States on January 17, 2026