DKJ type Reversing Sub

DKJ type reversing sub is also called reversing spear, which is a special tool for reversing stuck drill stem above stuck point in drilling and workover operation.
In treatment of stuck drill stem, it can work as a fishing pin tap in reversing operation.
When the fish is stuck or can’t be reversed in fishing or reversing operation, the fish can be reversed from reversing sub and the fishing drill tool is tripped out.