Gatco Sharpeners Tri-Seps Serration and Knife Sharpener, Charcoal is a part of the high quality and dependable Knife Accessories from Gatco Sharpeners. All of the features you need for a price you want. Knife Accessories from Gatco Sharpeners are well known for their quality and Gatco Sharpeners Tri-Seps Serration and Knife Sharpener, Charcoal upholds that standard.