... seal structure can enhance the seal performance.The compensator system and advanced grease can greatly increase the lubricating reliability.6.Bearing ... suitable for various formations by cutting structure with different tooth shape,tooth density and tooth exposure hight.8.all IADC code available in our ... 22”),609.6(24”)660.4(26”)Available models: Steel tooth(IADC)111, 121,131117,124,126,127,136,137 211 ...