Hole saw Plumbers kit, contains the most popular sizes of hole saws; 19, 22, 29, 38, 44, 51 and 57 mm, two arbors complete with pilot drills and arbor adaptor supplied in a strong plastic case. The hole saws are bi-metal 4/6 tooth pattern, designed to cut holes fast in most metals, wood, plastic and cast iron. Use on glass fibre is not recommended.