... for grouting pile hole, jet-grouting hole, large dia.pile with drilling smaller hole BG-60 casing extractor is a special ... purpose equipment used for extracting the case from the hole. It is suitable for grouting pile hole ... , jet-grouting hole, large dia.pile with drilling smaller hole etc., and drilling with caseTechnical Specifications Casing dia. (mm) Φ42~Φ108 ...