Features:Tough hole saws for wood, plasterboard, plastic, PVC pipe, fiberglass, thin aluminum plate and non ferrous metals.Suitable for plasterboard, plastic, wood, MDF, aluminum, computer tables etc.These hole saws feature thicker walls to minimize tooth loss and improve durability. This design effectively removes sawdust and chips and helps prevent plugs from becoming stuck in each saw. Hole saw sizes:Contains 12 hole saws 19, 22, 29, 32, 38, 44, 51, 64, 76, 89, 104 and 127 mm Note:The center bit is harder and easier to drill, but the stronger the hardness, the easier it is to collapse.keep the drill bit vertical, the correct method of operation to maintain longer life and better work efficiency. Package:12 x Carbon steel heat treated hole saws2 x Mandrels1 x Installation plate1 x Hexagonal spanner