●Size: 12mm/19mm ●The four plastic threaded guides are designed to fit faucets ●Cutter sizes: 17 mm ●Suitable for some 12mm taps ●Fits most taps on the UK market. All four plastic threaded guides are designed to fit BS1010 18 tpi taps and BS 5412 threads with BSP thread. The tool comes with three galvanized hardened steel cutters that repair the most popular 12mm and 19mm (3/4") taps. Product Draper