Unless otherwise specified, this profile is the standard for all wireline core bits as well as core bits with kerf widths greater than 7 mm (0.27 inch) that are used on conventional core barrel systems. This bit crown profile provides good penetration rates with relatively low bit loads. It is recommended for use in hard, consolidated formations and will usually provide better initial penetration rates than a bit manufactured with the “Flat-Face” (Style ‘F’) profile.

This profile is the standard for all impregnated diamond core bits with kerf widths of 7 mm (0.27 inch) or less. It is also recommended for impregnated diamond core bits with kerf widths in the 7 to 20 mm (0.27 to 0.79 inch) range that are intended for use in predominantly fractured formations. This profile is less susceptible to in-hole damage than bits that are manufactured with the “V-Ring” (Style ‘V’) or the “Tapered” (Style ‘TP’) profiles. When applied in hard, consolidated formations, the “Flat-Face” profile tends to require less initial in-hole conditioning than a “V-Ring” (Style ‘V’) profile bit but usually requires the use of higher rotational speeds during the initial break-in period in order to establish a good rate of penetration.