Bosch T321BF Speed for Metal Jigsaw Blades (5 Pack) The Bosch 2608636707 is a 5 pack of T 321 BF Speed for Metal Jigsaw Blades delivering fast straight cuts in metal. The patented tooth geometry of aggressive and robust teeth further increases cutting speeds. With Bi-metal, fully hardened high-speed steel tooth strip and highly elastic carbon steel body make the blade breakproof. Fine tooth pitch cuts medium-thick metal pipes and profiles, long-length blade cuts pipes and profiles. Areas of application are: medium-thick sheet metals, perforated sheet metals (2.5-6 mm), sandwich materials (