This saw blade is designed for fine cutting of material over 1/8" thick. Use these high quality blades to cut through a variety of metals, fiberglass and plastic. It is great for body work and exhaust work. These bi-metal blades contain cobalt for long lasting, shatterproof use. Features maximum speed of 10,000 strokes per minute. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.