タイトルまたは説明

The tricone rock bits are important tools used for drilling are widely used for geoloical prospecting, development of oil and ***** addition they are used for drilling water wells, blast holes and making holes for seismic prospecting, and used in construction ***** there are eleven common types of tricone rock bits.
The size of gauge diameter and the sizes and types of connections are strictly designed in accordance with the standards and specifications in API.