200 x 50 x 25mm (8” x 2” x 1”), The Fine India stone is an oilstone made with aluminium oxide abrasive. This abrasive leaves a fine edge on knives and tools. The 200 x 50mm (8" x 2") stone is also a full 25mm (1") thick. The extra thickness is useful when you are using the stone in your hand to sharpen knives and larger tools.