Open Lok 1-3/8" Carbide Teeth Multi-Material Oscillating Multi Tool Blades have a unique aggressive tooth design for cutting wood, screws, nails, cement board, plaster, and more. Carbide Teeth blades last up to 50X longer than standard bi-metal blades and can be used in a wide range of materials while maintaining longer blade life. The thin kerf design and aggressive Carbide Teeth offer faster cuts.