Polmak casings are machined from high quality seamless cold drawn steel tubing, which meet or exceeds DCDMA and BSI material specifications and tolerances. They are manufactured in both metric and DCDMA standards. Casings are manufactured usually with right hand thread and with left hand thread the left hand thread manufactured upon request.

Casings are lowered in the hole to keep the walls from caving and to prevent loss of circulating fluid. They are also used to recover stuck tools by reaming down the hole with diamond casing shoes.