||Natural Drill 1: Is composed of very
healthy closed octahedral and dodecahedral Stones (Cups 1 & 2).
Used for Coring and
Drilling the most demanding ground formations.
||Natural Drill 2: Is composed of
blocky, healthy, closed and slightly open octahedral & dodecahedral stones (Cups 1-3).
for coring and drilling hard and abrasive ground formations.
||Natural Drill 3: Is an economical
choice of Blocky
(Cups 1-3), but slightly irregular healthy stones.
Used for softer ground formations.
||Natural Drill 4: Is a blocky, medium
strength product, specifically engineered to be economically Interchangeable for both the
gage as well as the non-critical areas on the bit face.
||Natural Drill 5: Is composed of
Blocky Stones (1-4 cups) designed specifically for use as a gage diamond.