Releasing and circulating overshot is designed for external fishing operation. The main body of releasing and circulating overshot consists of upper sub, bowl and guide which are made of heat-treated alloy steel. These will provide enough strength and pulling power while fishing. Depending on different situation, there are two sets of internal components we can choose: a. Overshot with basket grapple components b. Overshot with spiral grapple components The circulating feature allows fluid to be pumped down while the tool is engaged with the fish, helping to wash away debris. The releasing mechanism allows the tool to disengage from the fish if the fishing operation is unsuccessful.