These are the Slot Machine Motorized Hinge Slotting Tools Replacement Nylon Hinge Slotting Blades. FEATURES: Quickly Cuts Clean, Straight Perfect Hinge Slots Without Gouging Or Being Hindered By Hard Spots In The Wood Unique Counter-Sawing Dual-Blade Action Removes Wood To Form A Perfect Hinge Pocket. Safer and More Precise Than Cutting Hinge Slots With A Hobby Knife 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. SPECS: Blade for CA (each): Length of Blade: 3/4" Thickness: .008" (.2mm) Blade for Nylon (each): Length of Blade: 3/4" Thickness: .012" (.3mm) Blade Cutting Depth: 9/32" COMMENTS: GPMR4015 Blades for CA Hinges Slot Machine Cuts Slots To Accommodate Most Hinges and Tail Gear Brackets Such As: Great Planes, Sullivan, Goldberg (Klett), and Dubro (except for the cotter pin hinges-slot will have to be deepened 1/16" more). Slot Machine has a One Year Limited Warranty Safety Precautions: Blades Are Sharp: Keep Out Of Reach Of Children, Use Safety Equipment Secure Parts Being Cut, Use For Hobby Use Only and Always Unplug. ir/jl