spetool 1/4 end mill for aluminum 3 flutes cnc spiral router bit for aluminum cut non-ferrous metal upcut extra long 4 inches spetool if the bit snapped, please contact first, we will solve it. </p> <p>solid carbide spiral router bit with 1/4 inch shank and 1/4 inch cutting diameter, 1 inch cutting length, 4 inch for total length;</p> <p>flat top with 3-flute, material: hrc55 carbide with no coating; </p> <p> </p> <p>for aluminum, non-ferrous mental, plywood, oak, mdf, and any hardwood working and long service life for sharp; </p> <p>the route bit suit for cnc router and any brand plunge router with 1/4" collet; </p> <p> </p> <p>end mill bits are suitable for side milling, end milling, finish machining, etc. </p>