Tactile paving drill.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...l_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ving_drill.jpg
Previously:
https://www.homemadetools.net/forum/...633#post155533
https://www.homemadetools.net/forum/...616#post151713
https://www.homemadetools.net/forum/...253#post169183
https://www.homemadetools.net/forum/...103#post164990
https://www.homemadetools.net/forum/...346#post122023