This heavy-duty 8 Pt. snap knife, has a plastic encased steel track blade sliding mechanism, that gives ultimate torsional strength. The steel track blade rail of the SK-504 gives maximum durability during normal and heavy cutting tasks. The rigidity of the channel offers a more stable cut along with durability. Excellent for wallpapering and rolled stock cutting. Features: economical, easy to use, no tool blade change, ultra sharp, 3 blades, 8 points per blade