... durability 3.Fast drilling rate 118 single tooth drilling bits / bit1.Button bit: small tooth , big tooth , conical inserts , chisel inserts2.Applicable: ... hard , very hard formation4. After service: repair the blade ,tooth or as your need and you could customize 5.Covers ... sealed(HA), not sealed(W)7.Types: steel tooth tricone bit (mill tooth tricone bit) and tricone bit (tungsten carbide inserted ...