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 spiral blades saw in all directions with 360Â degree cutting capabilities. Excellent for 0Â degree radius scroll or fret work - no need to turn the workpiece. Bevel cut letters and numbers. This flat end blade has a.041" kerf. TPI is 36. The universal number for this blade is 4. This blade is ideal for pieces too large to turn.