The Mastercraft 3” Jigsaw Blade Set 5-Pack features blades with an impressive 21 teeth per inch and a ground tooth pattern that allows them to cut cleaner. The electric saw blades in this 5-pack are intended for cutting through thin metals such as sheet metal, and utilize a 21 TPI tooth design to make much smoother cuts in materials as thick as ⅛" (3 mm). The saw blades’ bi-metal construction provides them with extended overall tool life when compared to more traditional steel saw blades, and their T-shank adaptor allows them to easily fit onto most standard jigsaws. These Mastercraft saw blades boast an overall length of 3” (76 mm), and provide a working length of 2” (51 mm) for cutting.