Lenox 20769C543JA Bi-Metal Jig Saw Blade Kit with U Shank, 5 Piece Super sharp to make precision cuts fast without deflection. Ground to precision sharpness for straight cuts and a smooth finish Bi-metal construction allows blades to bend and flex without breaking Fits jigsaws that use a u-shank bit Includes 456J, 450J, 324J, 320JC, and 318J blades