These are the top quality scroll saw blades woodworkers ask for by name - OLSON! Use these plain end blades with scroll or jig saws manufactured or sold by Delta, Rockwell, Powermatic, RB Industries, Hegner, Sakura, Shopsmith, Excalibur, Rexon, Sears, as well as hand-held fret and jewelers saw frames. These 5" blades will easily handle precise cutting of irregular shapes and straight cut off applications in all types of sheet materials. This package has 12 of each: Reverse Tooth Blades #446R, Skip Tooth Blades #448F and Spiral Blades #463S.