conicalinsert on gage and inner rows for durability and sustained penetration rate. Designed for effective drilling in medium-hard and abrasive formations with high compressive strength such as hard mudrock,sandstones,limestone,dolomite,phyllite,soft granite,etc.Application:29000-38000Psi Roller-Ball-Roller-Thrust Botton/Sealed Bearing
Roller-Ball-Roller-Thrust Botton/Sealed Bearing,TCI(Tungsten Carbide Insert) Spherical inserts on gage and oval insert on inner rows. Designed for effective drilling in hard and abrasive formations with high compressive strength such as high limestone,hard dolomite,hard sandstone,granite,silicified limestone,hematite,magnetite,etc.
