The Lenox Tools 20757CT450J U-Shank High Carbon Steel Fine Wood Cutting 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, 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.