Bi-Metal Bandsaw Blades. Our brands, Honsberg & Lennox. Bi Metal bandsaw blade made from ~4% high chrome alloyed backing material and a HSS cutting edge made from HSS M42 / material No. 1.3247 with a cobalt content of 8%. The teeth hardness of approx. 68 HRc combined with a tenacious backing material with high bending fatigue strength. These are ideal for the cutting of all common steel grades up to a hardness of approx. 45 HRc in all diameters.