Bosch 5-Pack 4-1/2" Progressor High Carbide Steel T-Shank Jigsaw Blade is designed for straight, fine, splinter-free, accurate cuts in thin or thick materials such as hard/soft woods, OSB, particleboard, plywood, and laminated particleboard. The patented progressive tooth design produces fast cuts and long life in thick and thin materials. The T-shank design provides maximum grip and stability and fits 90% of all current jigsaw makes and models.