Apex Double Side Medium Size Honing Stone (2400 and 4500 Grit): The honing stone / whetstone is used for honing (sharpening) the edge of the blade when it dulls, this is an essential part of your cut throat razor maintenance kit. Ideal for sharpening razors, surgical instruments, knives cutlery and craft tools. You should thoroughly soak the honing stone in water prior to honing and frequently re-soak during the honing process. Note that after honing and fine refinement of the edge of the blade, stropping with a hanging leather and canvas strop is still required prior to shaving. This is a double sided hone one side the cream coloured side is 2400 Grit while the Grey side is 4500 Grit. Dimensions: 150 mm x 50 mm x 20 mm, Fine grit topside (Grade 400). The razor is shown for illustration purposes only, it is not included with the honing stone.