Heat treated teeth. For hard and soft woods, plastic, plasterboard and non ferrous metals. Contains 12 holesaws 19, 22, 29, 32, 38, 44, 51, 64, 76, 89, 102 and 127mm; 6mm (1/4") and 10mm (3/8") arbors; Reinforcing plate and hex key. In robust storage case.