What tools should I use to dig a hole in a pebble to make a flowerpot? Is it an angle grinder? If you want to drill a deep hole the size of a ping-pong ball, do you use an electric drill?

I'll tell you the best way: 1. Draw the approximate location of the pit to be dug on the cobblestone with a marker. 2. Use an angle grinder to install a saw blade for cutting stone, cut a cut with a predetermined depth of about 10mm vertically at the excavation position, and then do the same in the vertical direction of the cut until it is cut into a grid. 3. Insert a screwdriver (flat head screwdriver) into the middle cut with iron sheet, and then tap the iron sheet screwdriver with a hammer to take out the square stone core. 4. Install a suitable small cutting saw blade with an angle grinder and scrape it repeatedly in the pit where the stone core is taken out, and polish it smoothly (scraping with water is better). Use an angle grinder to install the appropriate tools (available in stores that sell angle grinders).

This method can be used to make flowerpots, fish tanks and ashtrays.