Auger uses a spiral drill bit to rotate to bring soil or loose materials out of the hole. It is suitable for soft soil layers and quick shallow drilling. Core Barrel uses a ring drill bit to cut the formation. It is mainly used for hard rock layers such as granite and limestone.

A roller bit core barrel is a specialized foundation drilling tool built for hard rock. It uses rotating cone cutters instead of teeth, delivering faster penetration, longer service life, and better performance in extreme formations!

We all know how tricky it can be when comes to using a Core Barrel Roller Bit. Using roller bit is not like using the bullet teeth, while bad welding work can make the whole expensive tools scrapped without even into the piling hole.

Bullet Teeth are ideal for soft to medium-hard formations（≤80MPa）Bullet Teeth are point-attack cutters ideal for penetration., while Roller Bits are built for harder rock layers（≥100MPa）Roller Bits are rotating cutters that crush and grind hard rock formations. The right choice depends on your project’s formation, machine, and goals and replacement frequency in hard formations.