Rock bits are divided into steel tooth bit and TCI tricone bit. The size is 4 3/4'', 5 1/2'', 6'', 6 1/2'', 7 1/2'', 8 1/2'', 9 1/2'', 10 5/8'', 11 5/8'', 12 1/4'', 13 5/8'', 14 3/4'', 15 1/2'', 16 1/2'', 17 1/2'' etc..

To increase steel teeth life, steel teeth are hardfaced with wear-resistant tungsten carbide based material. The gauge may be protected with tungsten carbide inserts. Shirttail is hardfaced along its leading edge.

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