Dymaxion Diamond Core Drill for Limestone/Asphalt 150mm x 550mm 1.1/4" UNC Fitting CLSU150-550

Suitable for cutting limestone and asphalt.
Hard wearing segments resist wear in abrasive materials.
Diamond core drills and hole saws require the use of proper lubrication, correct drill speed and proper pressure.
Drilling methods and techniques vary significantly depending upon the material being drilled.
To achive optimum cutting performance and maximum core drill life use a slow to very slow drill speed, low drill pressure, and plenty of water for lubrication.
1.1/4" UNC fitting for use in core drilling machines.
Diamond core drills only drill out a portion of the resulting hole so they drill much faster than conventional blunt nose drills.
The life of any type of diamond drill depends upon the hardness, abrasiveness and thickness of the material being drilled and the specific drilling techniques used.
Using diamond core drills in hard materials is not difficult, however drilling the hole takes time.
You should consider that they aren't "drilling" a hole - they are "grinding" a hole.
DO NOT USE HAMMER ACTION.