A professional quality 17pc hole saw set manufactured from high carbon steel for cutting circular holes in wood, plasterboard, plastic and non-ferrous metals. The set consists of THIRTEEN hole saws and TWO arbors fitted with HSS drill bits, along with a metal locking plate for use on hole saws larger than 44mm and a 2.5mm hex key. The hole saws have heat treated teeth with the blade being 1mm in thickness. The hole saws come in the following sizes: 19, 22, 25, 28, 32, 38, 44, 51, 64, 76, 89, 102 and 127mm. Arbor 6mm (1/4"): For 19, 22, 25 and 28mm hole saws. Arbor 10mm (3/8"): For 32mm to 127mm hole saws. Cutting depth is 22mm to 24mm (approx.). Comes with its own easy to see blue carrying case, unlike the other dreary grey cases on here.