5 Rock Drilling T ools 800 8726899 Brunner Lay Carbide Applications Designation Standard Spherical carbides for use in medium to hard rock with fractured or seamy applications None Conical For use in soft to medium rock hardness more aggressive with faster penetration rates C Parabolic Semiballistic shaped sometimes called baby ballistic more aggressive than the spherical carbides for soft to medium consistent rock P Ballistic Bullet shaped very aggressive fast penetration in soft to medium consistent rock B Choosing the right carbide The larger the volume of carbide the more aggressive the bit The more aggressive carbides assist movement of the chips away from the face as there is more room for airfow on the face of the bit These more aggressive bits help to break out larger chips which increases the penetration rate There is also a greater volume of carbide to wear away which can lead to longer bit life Add last letter P CB to our part number for the desired carbide Standard carbide S has no designation except on retrac bits Carbide