Super Spin Bite for V-Groove

The front is firmly attached to the backspin and the ball stopped on the green.

This may be because the grooves of the iron are crushed.

The "Super Spin Bite" is an item to restore the corners of the chipped grooves and restore the amount of backspinI want you to try it before you buy your clubs.

Super Spin Bite for Square Groove

This is for iron with groove grooves.

Since it goes into a crushed groove, it will be a little bit of force but you will be able to restore the amount of spin that is worth it.