Excel 20560 No 3 Jewelers Saw Blades Product Details Excel 20560 No 3 Jewelers Saw Blades 12 piece Size 5 1/8 inch long 0.12MT 46 teeth per inch Made of carbon steel heat treated to 56-57 hardness Use #68 drill bit for pilot hole to start inside cuts Recommended for 16 - 18 gauge material Heavy Duty for cutting wood, plastic, rubber, and thin metal Use Eurotool Cut Lube to extend jeweler saw blade life