SANDFLEXand 0174; BI-METAL, 3906 The virtually unbreakable & shatterproof Bi-metal blade with precision ground teeth for all kinds of metal sawing. With a blade back of strong, flexible spring steel & a tooth line in high-alloyed super high speed steel, this blade is guaranteed to keep its sharpness for a long time. The SANDFLEX blade combines extreme cutting performance & wear resistance with a high degree of flexibility & is vastly superior to all-hard high speed blades or conventional, flexible blades. Packaging-3P: 3 blades, 1 each of 18, 24 & 32 TPI, in plastic pouch, box of 10 packs.