The Bahco 3906 Sandflex® Bi-Metal Hacksaw Blades are virtually unbreakable and shatterproof with precision ground teeth for all kinds of metal sawing. 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.These Bahco 3906 Sandflex Hacksaw Blades 300mm (12in) x 18 TPI ;are supplied in a pack of 100: 10 bundles of 10 blades in black, plastic box with transparent cover.