@lanoneyu: Professional excavator hydraulic telescopic arm modification. Expand working depth, match rotary drill & clamshell bucket. For deep digging, dredging and piling. Sleeve arms for piling, extended arms for underwater work. Custom fit for Sany, SDLG, CAT.#ExcavatorTelescopicBoom #ExcavatorModification #PilingConstruction #LongReachExcavator #ExcavatorAttachment