The MILWAUKEE OPEN-LOK 1-3/8 TITANIUM CHARGED Bi-Metal Multi-Material Oscillating Multi-Tool Blades are made from premium high-speed steel. These bi-metal blades are ideal for cuts in wood, nails, PVC, and drywall. TITANIUM CHARGED Bi-Metal blades have an optimized titanium blend for maximum wear-resistance and up to 15x longer life vs. high carbon steel (HCS) blades. These blades feature a reinforced Universal Fit OPEN-LOK anchor for better strength & control and allow for quick blade changes across 100+ multi-tools. Not compatible with Starlock tools. MILWAUKEE oscillating multi-tool blades are designed and made in the USA with global materials.