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 unique crown tooth blades cut on both up and down strokes. Two way cutting action provides a smooth, slinterless finish, and clean edges. When worn, the blade can be turned over for a fresh set of teeth! This blade is.026" wide x.013" thick. TPI is 20. The universal number for this blade is 2. This blade is ideal for extreme radius cutting and fretwork.