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. These precision ground blades have razor sharp reverse teeth with widely spaced gullets to cut straighter, faster, smoother, more accurately, while minimizing burning and providing the ultimate sand-free, splinterless finish with a clean edge. This double tooth blade is.049" wide x.018" thick. TPI/#Rev is 9/6. The universal number for this blade is 9RG. This blade is ideal for fast, close radius cutting. Double tooth blades are especially good for cutting hardwoods.