4-in-1 general purpose set with 4 removable blades 32 TPI thin kerf 5-1/2″ long, 52 TPI ultra thin kerf 4-1/2″ long, 24 TPI medium thin kerf 4-1/2″ long saber, and a 24 TPI keyhole saber blade 2-1/4″ long. Blades are attached and held with a knurled nut. Replacement Blades Sold Separately.