Drilling 400mm

This is Ralph.  He is drilling a 400mm hole in the side of a pipe.

Drilling 400mm

This process involved bolting on a hydrostress drill rig to the concrete required drilling a 400mm hole.  Due to the location of the hole required, the drill rig was mounted on an angle as can be seen in the above images.

Ralph works for Sharp Concrete Cutters and Drillers.  He is a professional concrete driller and has specialised training in order to determine how the hole ought to be drilled, and what equipment was required to do the job.

Ralph is using a Weka SR38 drill motor as well as a 400mm core drill from Holer Diamond Tools.

See other examples of concrete drilling:

Man Hole

Drilling Through a Finished Wall

Samoan Consulate-General


Concrete Drilling

Drilling 400mm

Core drilling techniques are used when tradespeople require precise, circular holes drilled.

Any hole, from 12mm to 500mm diameter, can be achieved to make openings for plumbing, electrical, telecommunications


Stitch drilling is a process where we drill a series of overlapping holes in order to make openings.

Sharp Concrete Cutters and Drillers proudly partners with Holer Diamond Tools to provide our customers with the latest in concrete core drilling technology using diamond matrices developed especially for the New Zealand construction industry.