Heat treated teeth suitable for cutting hard and soft woods / plastics / plasterboard and non ferrous materials. Manufactured from heat treated steel for strength and durability. Cuts smooth / clean accurate holes up to 25mm thick through dry wall wood and plaster. Comes with 6mm (1/4") and 10mm (3/8") arbors depending on the size of hole needs cutting. Reinforcing plate and hex key for help in stable accurate work when required. Supplied in a blow molded case for easy storage and transportation. Set Includes; 8 X Hole Saw Cutters diameter; 19mm, 22mm, 28mm, 32mm, 38mm, 44mm, 51mm, 64mm 2 X Drill Adapters 6mm (1/4") and 10mm (3/8"). 1 X Allen Key.