Spyder Black Series 8% cobalt bi-metal reciprocating saw blades are made in the U.S.A. These long life blades are ideal for tough cutting tasks of various materials. Up to 10x more cuts and 3x faster than conventional bi-metal blades. 10x more cuts and 3x faster than conventional bi-metal blades Shatter and heat-resistant 8% cobalt bi-metal blades power through the toughest cuts Applications - metals and wood with nails Cut up to 3x faster than conventional bi-metal blades 8% Cobalt teeth provide exceptionally long cutting durability and heat resistance Shatter resistant and durable for the toughest cutting applications Application - metals and wood with nails Made in the USA