hese stones are made from best quality silicon carbide that is procured from the reliable and certified vendors of the industry under well equipped production unit. This is best for edging or sharpening the product. Highly durable and long lasting. Code Sizes 018 Emery Stone, Silicon Carbide,75 X 22 X 10mm - No. 149 019 Emery Stone, Silicon Carbide,100 X 45 X 15mm - No. 112 020 Emery Stone, Silicon Carbide,125 X 50 X 20mm - No. 111 021 Emery Stone, Silicon Carbide,150 X 50 X 25mm - No.