- The virtually unbreakable and shatterproof Bi-Metal blade with precision teeth for all kinds of metal sawing\n- With a blade back of strong, flexible spring steel and a tooth line in high-alloyed super high speed steel, this blade is guaranteed to keep its sharpness for a long time\n- The Sandflex® blade combines extreme cutting performance and wear resistance with a high degree of flexibility and is vastly superior to all-hard high speed blades or conventional, flexible blades\n- Packaging:-100 : 10 bundles of 10 blades in black, plastic box with transparent cover-10P: 10 blades in a special package with hanging loop-5P: 5 blades in a special package with hanging loop-3P: 3 blades, 1 each of 18, 24 and 32 TPI, in plastic pouch, box of 10 packs-2P: 2 carded blades, box of 10 packs\n- 3818-300-PROG, have a progresiv toothing from 18-28 TPI