Usage Tips:Premium material: scroll saw are made of carbon steel. Scroll saw made of carbon steel with good toughness and can be bent at a large angle without breaking. Fine cut saw good workmanship, sharp teeth, clean and even, with high hardness and strength. Good workmanship: our fine cut saw are finely processed and it improves sharpness and cutting speed. Curved saws are very relaxed, the saw blade is not tightened. Different shapes can be sawn very labor-saving. Different saw blade: you can choose the right saw blade according to the thickness and hardness of the material at hand. The thicker the workpiece you want to cut, the thinner the blade should be. It is recommended to use the saw blade #1, #2, #3 to saw the metal. #4 # 5 # 6 # 7 is suitable for sawing wood; #8 can be used when sawing plastic. Package Content:Total 20 pieces fretsaw ,4 different saw ,10 teeth,15 teeth,18 teeth,24 teeth. Total length: 133 mm; 3 mm wide; 0.3 mm thickness; distance between left and right pins: 127 mm. Teeth per inch: 10/15/18/24 TPI (number of teeth per inch). Wide application: perfect for cutting wood, soft and hardwood as well as thin materials, plastic foam and some low hardness metals. If you are not sure whether the fretsaw blade is compatible with your machine, please measure the size of the saw blade used. Colour: Black Material: Carbon Steel Package Contents: 1 set * Scroll Saw Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.