Right now it is the BosCH SDS-plus® Bulldog™ Xtreme™ Rotary Hammer.

https://www.boschtools.com/us/en/boschtools-ocs/sds-plus-hammers-11255vsr-hdc-197862-p/


Had to put in a new water line to the house. The foothills of the Santa Catalina Mountains here in Tucson is rocks and boulders with some dirt and caliche here and there. Caliche is like soft cement. Even the excavator bucket couldn't get through it! This tool saved me a great deal of time and and effort. Using a spade bit it cut through the caliche and loosened rocks where the excavator coulldn't dig. It was also used to remove a 4" wide x 6" long x 6" thick piece of concrete slab to run one water line into garage. It worked flawlessly nonstop for an hour to get that chunk out. Awesome tool.

[Linked Image from imagizer.imageshack.com]

The conglomerates between wall and ditch were not dug there, just something I collected over the years.