A feed roll spike for mounting to a surface, i.e. the outer surface of a feed roller of a harvester head or a debarking machine. The feed roll spike comprises a substantially truncated cone shape base having a top side, a bottom side and an axis; and evenly-spaced identical projections extending upwardly from the top side of the base. The space between the projections defines channels.

A feed roll spike for mounting to a surface, i.e. the outer surface of a feed roller of a harvester head or a debarking machine. The feed roll spike comprises a substantially truncated cone shape base having a top side, a bottom side and an axis; and evenly-spaced identical projections extending upwardly from the top side of the base. The space between the projections defines channels.

Clamp for limiting cracks in logs, having two blades which each extend from a back surface to a cutting edge along a cutting direction and which are tapered in the cutting direction, the cutting directions of the two blades are aligned parallel to one another and wherein the two blades are connected by a first connecting bar which extends between first end regions of the two blades and by a second connecting bar which extends between second end regions of the two blades.