The Victorinox Swiss Army 4.3391.5 is a replacement sharpening stone designed for the 4.3393.2 honing system. This coarse silicon carbide stone features a crysolon single grit, ensuring efficient sharpening for your knives. Its durable construction provides long-lasting performance, making it an essential accessory for maintaining the sharpness and precision of your cutting tools. Ideal for both professional and home use, this sharpening stone enhances the longevity and effectiveness of your knives.