cross-over joint Denotation Top junction block Lower junction block Type Kelly joint Kelly Drill pipe joint A or B Kelly joint Drill pipe joint Drill pipe joint A or B Drill pipe joint Kelly Drill collar A or B Crossover joint Drill collar Drill collar A or B Bit joint Drill collar Bit A or B Swivel joint Swivel lower joint Kelly Type C Fish joint Kelly Drill pipe joint Type C Drill pipe joint Fishing tool Type C
