DEWALT DW00717-B1 Professional SDSand Bit (160 mm x 100 mm x 16 mm)

Used the but in Bosch machine, it is making hole perfect even though concrete wall and ceiling.

The drill bit is superb!Cuts like butter through concrete.Has some issues of eccentric fit into a three pronged Jackob’s chuck. On a professional drill machine, hopefully it will fit better.But it means business!!!!

Drills through concrete like butter... Doesn't retain heat.. so easy to change bits