I'm digging up old little rocks from my underground pool. This 3" chisel lasted 3 days before breaking in my Makita SDS rock drill bit. Worked fine until it broke. Used to use an S&R tile bit (same size) which lasted about 11 days before the same type of breakage occurred. A much larger area was worked on with a heavier duty Dewalt bit, they are more expensive but I will buy another S&R bit to finish the job.