ZELCAN CO-Z 65mm 50mm 30mm SDS Plus Shank Hole Saw Cutter Concrete Cement Stone Wall Drill Bit Kit, Shank Drill Bit Cutter for Brick Concrete Cement Stone

I guess I didn’t expect a rather good set of coring bits for the price and was pleasantly surprised to see how nice and solid they were. Worked perfect for me to get through a curb. Would recommend.

Buen producto

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.

muy funcionales, y de buena calidad. las recomiendo al 100%

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.