OwfeelHight Quality Two Ends Seal Cutting Carver Graver Knives Carving Knife 4PK Ideal for professional carving of various materials like stone, plastic and wood etc. Good seal cutting tools, 4 different sizes to meet your different requirements. Craver knives size: 6x6x195mm, 5x5x195mm, 4x4x195mm, 3x3x195mm. Width of the knives: 6mm/5mm/4mm/3mm. Graver Knives Hardness: HRC63.