Bi-Metal jigsaw blades are designed and manufactured for the professional user. Bi-metal blades last longer than high speed steel or carbon blades. Detail to the material used, tooth shape and sharpness make these blades cut clean, fast and have a longer life. Set includes: 48-42-5121, 48-42-5161, 48-42-5190 metal cutting blades, 48-42-5300, 48-42-5310 general purpose blades. No. 49-22-1178: Shank Type: T-Shank, Pieces In Set: 5 pcs, Length: Assorted, Cutting Material: Metal, General Purpose, Pkg Qty: 1, Package Type: Card