Dont run your heads empty.

Use these balanced sets to fill the empty pockets

1" wide  x 4" Long Long Filler Wedge Steel - 60 Deg. Corrugated - Hardened 5140. To fill empty Corrugated knife pockets

2 pieces of filler stock,  (+/- 1/16") in length , cut and balanced in pairs used to fill any standard corrugated back head dual hook head.