Core bits are purposed for core recovery in low-abrasive medium rock formations of V-VI category of hardness, interstratified with layers of hard rock formations

Modifications: are reinforced with additional PDC cutters. They have more durability than "C92". Distinctive feature: better core removal due to smooth rock cutting with PDC cutters. Flushing holes are carried outside core catchers in order to prevent core damage with drilling fluid.

Dimension acc. to new nomenclature Outside diameter, mm Core diameter, mm Code IADC Coupling thread Dimension acc. to old nomenclature 138,1/67 B908 138,1 67 S442 Ç-110 BIT-138,1/67 Ñ99 144/80 B910 144 80 S442 MK-124 BIT-144/80 Ñ99 146/80 B910 146 80 S442 MK-124 BIT-146/80 Ñ99 212/100 B913 212 100 S432 ÌÊ-180; Ç-161 BIT-212/100 Ñ99 212,7/100 B913 212,7 100 S432 ÌÊ-180; Ç-161 BIT-212,7/100 Ñ99 212,7/101,6 B913 212,7 101,6 S432 ÌÊ-180; Ç-161; MK-169 BIT-212,7/101,6 C99 215/100 B913 215 100 S432 ÌÊ-180; Ç-161 BIT-215/100 Ñ99 215,9/100 B913 215,9 100 S432 ÌÊ-180; Ç-161 BIT-215,9/100 Ñ99 215,9/101,6 B913 215,9 101,6 S432 ÌÊ-180; Ç-161; MK-169 BIT-215,9/101,6 Ñ99 292,9/100 B913 292,9 100 S432 ÌÊ-180; Ç-161; MK-169 BIT-292,9/100 Ñ99 295,3/100 B913 215,9 101,6 S432 ÌÊ-180; Ç-161; ÌÊ-169 BIT-295,3/100 Ñ99

• 212,7/100 B 913 E