Summary

Multi-Grooved Anvils

Bottom Knives with multi grooves

Free locking - anvils are locked by the knife shaft, typically an air expanding strip shaft
Set screw locking - a set screw fixes the rotation of the anvil on a hardened shaft
Multilock - Using a single grub screw, a flexible element tightens the multilock ring concentrically around the knife shaft eliminating problems with runout caused by set screw mounting