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One-piece, thru-hole bits are designed for fast work without the need to change shanks. The all-in-one core with SDS-max shank transmits power directly to the end of the bit. Thru-hole bits are more economical because of long life.
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Bosch HC6521 SDS-Max thru-hole rotary hammer bits drills all the way through without stopping. Aggressive tip provides fast break-through and large chip removal. The all-in-one core with SDS-max shank transmits power directly to the end of the bit.
Jason Freybuger
Reviewed in the United States on January 22, 2025
This works so much better than a Core bit goes in faster and requires less effort!
Sean Fendt
Reviewed in the United States on January 26, 2023
Bores holes in basalt rock - off label use but what I needed to do. Holes need frequent cleaning, but it did the job, 20+ 18 inch deep holes and still working fine.
Brandon
Reviewed in the United States on August 18, 2022
Great for any item that can be moved out the way, through the tilling process. Plugs easily, when in dirt & rocks. The “cup” plugs easily & needs to be cleaned a lot. This adds to the work process.
MATT
Reviewed in the United States on April 3, 2022
I used this Bosch Bit to drill into solid concrete for a fence installation utilizing my Bosch Hammer Drill. This bit pulverized the concrete while rotating the material out of the hole. I would highly recommend this bit.
Potts family Casa
Reviewed in the United States on July 6, 2021
I was able to drill 8 holes in solid basalt with this bit. We went a full 24" with the Hilti chuck going into the hole allowing a deeper footing for the uni-strut holding the solar panels. Word of caution: we got stuck two times, the first time because we went too long between vacuuming the debris out of the hole and it built up on the top of the bit and prevented removal of the bit, We removed the hammer and put the vacuum hose down in the shaft of the bit and we were able to clear the blockage. The second time a rock fell into the hole at about 14" of depth and lodged on the top of the bits flanges and the side of the hole, we had to use a smaller roto-hammer and bit and break the problem rock up and retrieve the large bit.
Compliance
Reviewed in the United States on June 30, 2021
Augering through limestone and this thing gets it done. Still going strong after several holes. Stop often use a shop vac to suck the material out of the hole and use water in the hole to aid in cutting and to keep the bit cooler.
Benoit Partikian
Reviewed in Canada on January 10, 2020
Good price for everyday use
Customer
Reviewed in Canada on January 26, 2019
As described and works great.
Richard Emond
Reviewed in Canada on May 9, 2017
As expected from amazon and Boschexcellent serviceLike the price and the delivery from amazonWill buy againR
Customer
Reviewed in Canada on May 27, 2017
Great product
Customer
Reviewed in the United States on September 21, 2015
Used commercially. These drill holes in concrete and do a good job unless you hit rebar. It will not cut rebar. They last a long time and are worth the price
karen williams
Reviewed in the United States on August 29, 2014
Works GREAT - does what is needed although the red clay mud can clog it at times. Excellent buy it was $300 cheaper than buying one locally.
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