JZG35 API 8C/8A Deadline Anchor Used for Oilfield Drilling and Workover Rigs Product Description Dead line anchor is used as a display instrument for indicating and recording the drilling string changes in weight and pressure, helping the driller to master the working parameter and judge the drilling state in drilling operation. It's mainly composed two parts: Body and Senor. It work together with the Weight indictor. Feature: Can be used in drilling rig, workover drilling