SKW series bit is non-sealed roller bearing bit .This is suitable for surface hole drilling for every kind of wells and upper sections with good drillability .It is with the advantages of low cost and high ROP ,ect. The size range of SKW series bit is from 14 3/4 to 26 inch roller cone bit ,and IADC values from 111 to 241 . For example :26 SKW111C. # MAIN STRUCTURE FEATURES 1.The drilling fluid can flow into bearing cavity directly to cool due to no seal. 2.For bit size of 14 3/4 inch and larger, bearing structure of the roller-ball-roller-thrust is utilized. web:http://www.tcirockbit.com