Victorinox Sharpening steel 20cm round sharpener 65 HRC hardness – UK Outdoor Store
Is a standard Victorinox Swiss Army knife steel hardness of 56 HRC (Rockwell scale) tough enough, and is it tougher than a standard pocket knife? - Quora
Amazon.com: Victorinox Swiss Army Cutlery Swiss Classic Fibrox Honing Steel, 10-Inch, Multicolor (6.8002.US1): Knife Sharpeners: Home & Kitchen