JCR Tricon Bit
Steel Tooth Open Bearing Rock Bit
Sizes of Bit in Inches Size & Style of Pin Connection
2-7/8" to 3" N Rod or AW
3-3/4" to 4-1/2" 2-3/8" REG
4-5/8" to 5" 2-7/8" REG
5-1/8" to 7-3/8" 3-1/2" REG
7-1/2" to 9-3/8" 4-1/2" REG
9-1/2" to 14-3/8" 6-5/8" REG
14-1/2" to 18-1/2" 6-5/8" REG or 7-5/8" REG
18-5/8" to 24" 7-5/8" REG or 8-5/8" REG

For more details about this Drilling Rig Contact
http://dthrotarydrilling.com/JCR-DRILLSOL/index.html