These are the top quality scroll saw blades woodworkers ask for by name - OLSON! Use these 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. Reverse Skip Tooth blades have the same performance and characteristics as skip tooth fret saw blades with the added benefit of reverse teeth for a smooth, splinter free finish on top an bottom surfaces. Excellent blade for eliminating tear-out on birch and maple plywood. Find all you need in one quick and easy assorted package. This package has 12 of each: #446R, #453R, #448R.