Great Planes Slot Machine Blade Nylon Hinge Slotting Tool, Medium FEATURES: Quickly Cuts Clean, Straight Perfect Hinge Slots Without Gouging Or Being Hindered By Hard Spots In The Wood Unique Counter-Sawing Dual-Blad INCLUDES: Two Metal Replacement Blades for Nylon Hinges or Tail Gear Brackets REQUIRES: Phillips Head Screwdriver to Remove and Replace the Screws Holding Blades Securely in the Slot Machine