Jointed keeper shuts out worm slippage.
The center pin attached to the screw enables spring mounting without shifting the worm.
In addition, it is easy to attach to any worm, and it prevents worm loss with super keeping power that does not come off even if a fish is hooked.
The joint spring keeper specification center pin makes it possible to attach the worm without shifting it. It can be easily attached to any worm and prevents worm slippage to the maximum.