The replaceable tips end mill/router bit tool body made from alloy steel with 4 solid carbide cutting inserts for maximum feed and stability specially made for CNC and milling machines. Each tip is made from micrograin carbide for maximum tool life and has 4 cutting rounded corners that can be rotated.Excellent for Cutting Aluminum Aluminum 5052 Bronze Copper Fomex with Aluminum FaceApplications: Milling / Surfacing / Facing Shouldering / Rabbeting Slotting / Grooving Use "Ramp Down" technique. Recommended RPM: 8,000 RPM WARNING!: Maximum recommended material depth in one pass 1/32" (1.0mm). Never attempt to cut ferrous metals with these bits. Inspect cut quality and adjust feed / speed accordingly. Note: For optimal results and extended tool life use mist lubricant system or air cooling.