Double walled segmental casing is a steel pipe used to protect the safety of surrounding soil and buildings during drilling rig of deep foundation pits. They’re usually installed on rotary drilling rigs and full-rotary drill machine.
The diameter differs from 600mm-4000mm for your selection, length based on your requirement.

Double Walled Semental Casing and Single Walled Segmental Casing are steel pipe used to protect the safety of surrounding soil and buildings during drilling rig of deep foundation pits. They’re usually installed on rotary drilling rigs and full-rotary drill machine.
The diameter differs from 600mm-4000mm for your selection, length based on your requirement.