Arkansas Sharpeners Soft Oil Stone AC5. This Knife Sharpener from the knife experts at Arkansas Sharpeners measures 4" x 1 1/2" x 1/2". Don't you dare wield a knife without the Arkansas Sharpeners Soft Oil Stone. Features of Arkansas Sharpeners Soft Oil Stone Knife Sharpener: Measures 4" x 1 1/2" x 1/2" Bulk packed Package Contents: Arkansas Sharpeners Soft Oil Stone Arkansas Sharpeners AC5: Soft Oil Stone