The Lenox Tools 20336BT450JR U-Shank Bi-Metal Down Cut Jig Saw Blade 4-Inch x 5/16-Inch x 10 TPI - 2 Pack provides users with a clean smooth cut in wood. The 10 TPI allow you to cut quickly on the down stroke, while the sharpness of the carbon steel and the precision ground teeth give you a nice clean finish. The teeth are ground to precision sharpness for straight cuts. These blades are made with a Universal Shank that fits most Jig Saws.