The ZCOJO Jobber Drill, M-42 Cobalt, 135 Degree Split Point, Size: #Z, NAS907 Type J features a 135 Degree Point and are manufactured to Aerospace Standard 907. Jobber length drills, commonly referred to as ”Jobber Drills”, are the workhorse of the aviation industry and the key to producing satisfactory holes is the quality of the drill. The quality of the jobber drills will determine production rates and tool durability.