The Diamond Products HDC14250 14in 911 Rescue Blade and Extreme Demolition Carbide-tipped blade is for metals, roofing and building materials, wood, tar, fire doors, plastic and rubber. Not suitable for concrete. Made with .250in. thick carbide chunks that allow extremely fast cutting that will not bind or load (an important factor in rescue cutting). Warning: When sawing, dust and material particles will be common as this product is very aggressive. Wear protective safety equipment when using and handling this blade. Blade edges are very sharp. Do not exceed saw manufacturer recommended RPM. Periodic inspections are required to insure proper condition. Never use damaged or cracked blades. Please consult warning sheet provided with blade.