Irwin Jigsaw Blades (5) t318a 10504230 HSS: Fully hardened high-speed steel for metal, aluminum, and non-ferrous metals. HSS Milled Teess: Provides long life and high speed cutting of metal. Cuts thin and thick metals at high speed and consistency. T-Shank Straight Metal for AEG, Bosch, DeWalt and Hitachi Jigsaws, Non-Ferrous Metal, Aluminum 1.5-3mm, Sandwich Material 1.5-65mm 2") HSS: Fully hardened high-speed steel for metal, aluminum, non-ferrous metals. HSS Milled Teeth: Long life and fast cutting of metal even thin and thick metal cuts fast and evenly. T-shank of AEG, Bosch DeWalt, Hitachi Jigsaw