Drill Collar Lift Subs are of one-piece construction and manufactured from alloy steel fully heat-treated. This heavy-duty type Drill Collar Lifting Sub is designed for use with the drill pipe elevators. The structure includes sloping shoulder and straight shoulder, which can be selected by customs. Drill Collar Lifting Subs are normally manufactured 1200mm long overall .The size of others are indicated in the table. However, this type sub can be made to any lengths desired.