Cartridges Catalogue Numbering System By referencing this easy-to-use guide, you can identify the correct product to meet your needs. MCFNR10CA3 10 C A 3 Cartridge Size Identifying Code Mounting Design Insert Additional of Cartridge of Cartridge Size Information C = Cartridge A-design conforming to ISO 5611 Insert iC Number of 1/8ths of “D” H1 = Cutting edge height of cartridge, in inches widia.com C89