Gatco Sharpeners Knife Hone Medium Serrated. The Gatco Sharpeners Extra-Coarse Blade Sharpening Hone is the fastest cutting - sharpens damaged edges and extremely dull blades can be used with all GATCO sharpening systems. All Gatco Sharpeners Extra-Coarse Accessory Hones contain our patent pending adjustable sliding guide rod and finger protection rails. Specifications for Gatco Sharpeners Knife Hone: Manufacturer: Gatco Sharpeners Package Type: Box Handle Material: ABS Overall Length: 8.5 in Blade Material: ABS Features of Gatco Sharpeners Extra-Coarse Blade Sharpening Hone: 80 Grit Sharpens damaged edges & extremely dull blades Package Contents: Gatco By Bear & Son Knife Hone Gatco By Bear & Son 15001: Knife Hone Medium Serrated