Jigsaw blades are used for a variety of applications including fine woodworking and metal cutting. Each tooth count is designed for a specific application.
In general the lower tooth counts are used for wood (up to 12 TPI) and the higher tooth counts are used for metal cutting(14 to 36TPI).
Please make sure you choose the proper shank to fit your jigsaw. Jigsaw blades are either universal shank (fits most Black & Decker, Skil and Dewalt saws). or Tang T-Shank (fits most Bosch, Dewalt and Porter Cable saws) Bayonet for the Porter Cable Bayonet Saw.
Bi-metal blades for surperior performance and long life in metal cutting applications.
HCS = High Carbon Steel. High carbon steel blades are superior performance and long life in wood cutting applications.