Features:GS Hydraulic retractable GS salvage spear can be used for downhole tools with standard GS salvage neck. Some tools are designed with standard GS salvage neck and GS hydraulic retractable salvage spear, which greatly improves the salvage success rate. The tool has high strength and can be operated under pressure; it relies on pressure difference to release without cutting pins and throwing balls; the release device is reliable and can minimize the force on the salvage spear.