Blacksmith Drill Bit 21x13 MM - Sparex Part S.171422

Blacksmith Drill Bit 21x13 MM - Sparex Part S.171422

Marsoni

M251S

$28.96

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

Blacksmith Drill Bit 21x13 MM - Sparex Part S.171422Blacksmith Drill Bit 21x13mm Sparex Part No. S. 171422 Abracs Blacksmith Drill Bits are manufactured with a large diameter and smaller shanks to enable use in standard drill chucks. Suitable for steel, cast iron, non ferrous materials. Product Specifications Brand ABRACS Conformity DIN338 Material High Speed Steel Tariff Code 8207506000 (mm) 21x13 Suitable For Information This product is not associated with any particular make or model OEM Fitment

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I tried these on my teenage son who has pretty yellow teeth after braces. You can’t really tell in pics but in person they made a difference. He hasn’t had any odd side effects or sore gums from using them and said they were easy to use. He wears them for the recommended amount of time although started lower the first time to make sure he wasn’t allergic or anything. But so far great product and we are happy with it!

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Reviewed in the United States on February 1, 2026

Sammy Squirrel

Grantham, US

★★★★★ 4

Work about as well as drugstore brands.

These are at least as good as the national brands at a fraction of the cost. They stick on easily and used as directed will whiten your teeth a few shades over the course of treatment.

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Reviewed in the United States on December 5, 2025

Verified Purchase

Sharon T.

Dallas, US

★★★★★ 2

Combersom

Cumbersome, does not hold 3nough water

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Reviewed in the United States on May 25, 2026

Miah Quesada

Massapequa, US

★★★★★ 3

Mixed Results

These strips fit comfortably and don’t slide around, which I appreciated. They are gentle on my gums and enamel, and I noticed a slight improvement in brightness after consistent use. That said, they aren’t as strong as some other whitening strips on the market, so if you’re looking for dramatic results you may be underwhelmed. Good for subtle whitening.

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Reviewed in the United States on October 2, 2025

Disappointed Reader

Cuba, US

★★★★★ 5

Does work well for removing minor stains

This product is probably best for removing minor staining - things like coffee, tea, red wine. I don't think it would work for longer-term stains that accumulate with age - the strips are not powerful enough for that. Very easy to use: just apply and leave on for half an hour or until you can feel that they are no longer well-attached. The "cleaning" process starts immediately - you can see the bubbles form. I am a tea drinker, and I notice immediate effect after putting these on. Don't expect miracles, but they will help with fresh stains for sure. For me, they do not increase the sensitivity, but my teeth are generally not sensitive. But they are peroxide based, so the possibility is always there that it could have that side effect.

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Reviewed in the United States on November 1, 2025