CMT 663.005.11 Spoilboard Surfacing Router Cutters w/Insert Knives 1-1/2"The CMT 663. 005. 11 is a Spoilboard Surfacing CNC Insert Cutter with Insert Knives. CMT CNC insert cutters for spoilboard surfacing and V groove routing. Uses replaceable 4 sided carbide insert knives for economical, long life CNC surfacing. SPECIFICATIONS Diameter (D) 1 1 2" Cutting Height (I) 12mm Total Length (L) 60mm Shank (S) 12mm Number of Teeth 3 Product Type Spoilboard Surfacing CNC Insert Cutter with Insert Knives Shank 1 4" Blade Material