CO-Z 65-50-30mm Hole Saw Drill Bit Set for SDS Plus Hammer Drills – Professional Kit

Joe Roe: I live on solid lava rock on Hawaii Big Island. I cut 18 holes through solid blue rock 12 inches deep for t-post. I used water on the the cuts and the tool is as sharp as it was new.

United States on Dec 09, 2023

Rodolfo García Osorio: Me ahorro mucho tiempo en andar martillando y sin dañar las paredes, lo malo que la utilice para perforar una losa y encontré varillas y pues se daño la broca pues se le volaron varios dientes.

Mexico on Dec 01, 2023

Quattroa4mQuattroa4m: It drilled a great 30mm hole, but not without Threadlocker.

The drill bit set screw came loose immediately, a total of three times. Rummaging around found some Red Threadlocker (Blue probably would have worked as well). Liberally applied to the set screw and we were ready...sorta.

Unfortunately, Threadlocker takes 24hrs to setup. However, you can bake it in the oven at 200F for an hour and get the same result.

One hour later, a few minutes of drilling, a perfect 30mm hole.

The downside is, you have to heat the assembly to 500F to breakdown the Threadlocker and remove the set screw.

Still giving it 5 stars, even with the extra prep work.

United States on Nov 25, 2023

TD-33TD-33: Overall I been very happy with the kit. It is a great value compared to the big box store’s options. I found the items to be well made and work as intended. Some helpful watch outs / suggestions: Add some never-seize paste on the shaft threads, as removing the hole saws can be tough after long drilling. Another, is to add lock-tight to the set-screw as it tends to loosen or fall out. In a pinch, I wrapped electrical tape around the shaft covering the set-screw and then put a slice in the tape at the screw. This way I didn’t lose the screw and I can re-tighten it through the slit. Finally I would like to thank ZELCAN for their great customer service with an issue I had with one of the hole-saws. They were very quick to respond and resolve it. More importantly they stand behind their products! Finally, I am so impressed with this kit that I bought one for my son to have for his jobs.

United States on Nov 24, 2023

Excelente muy práctico y buena calidad: Buen producto

Mexico on Sep 18, 2023

Shaka PakaShaka Paka: I needed this to drill some holes through 8 inch thick solid concrete cinder blocks for drain pipes. I drilled 7 2 1/2" holes (I hit rebar mid-way twice) and the drill bit worked just as good on the last hole as the first! I read other reviews that mentioned that the bit was difficult to get off the shank so I lubricated the threads with silicon grease and it separated each time without too much difficulty. Don't know if I'll need to use them again, but glad I have them in my toolbox!

United States on Aug 27, 2023

Irineo Octavio Silva Campillo: Lo utilizo para instalación de mini split

Mexico on Jan 13, 2023

guillermo gonzalez: Me gustó mucho la herramienta me facilita el trabajo y los acabados quedan mucho mejor
Recomendado 100%

Mexico on Nov 04, 2022

Baja Man: These are surprisingly good for the price. I live in Mexico and concrete is king here. Pushing them with a Bosch Bulldog hammer drill they are efficient. I did lose a tooth from one after hitting rebar (repeatedly for a while, should have stopped) which they are not made for although they do eat solid concrete cleanly. The set screws don't stay in long so the pilot bit eventually falls out but once the hole is started and the cutter registers in the hole you dont need the pilot. After a job the mandrel can be a bit hard to remove from the cutter as the threads have been hammered on. When I wear them out I will buy more (and avoid rebar). Wear ear and eye protection and rest occasionally to avoid overheating your drill. I rig a vacuum hose next to the cut to minimize dust and clean-up.

United States on Sep 18, 2022

Hector Adolfo Fernandez Ortiz: Si funciona bien pero el prisionero de la broca guía solo funciona una vez, al hacer el segúndo agujero se afloja y se pierde y se queda sin guía la broca 😥

Mexico on Jun 14, 2022