Sturdy but not suitable for standard impact wrench
Strong jets but custom size. They could have been metric but they were slightly larger and the hex would not snap on my impact wrench (black and deck). I filed it a bit and it fit, but it took some effort.
Pros
❺WIDE USAGE: Can be used for drilling in wall, brick, wood, glass, tile, stainless steel, concrete, etc. Remember to add water or coolant when drilling.