Downcut spiral router bit with 1/4 inch and 1/8 inch cutting diameter, 1 inch cutting length, extra long 3 inch for total length SOLID CARBIDE : The down-cut spiral router bit is made of solid carbide. Clean surface, neat, no glitches. CNC Spiral bits used for side milling, end milling, finish machining, etc. End Mill Bits can smoothly upcut groove and slots, mortises, cycles and dados with clean edge and top surface, straight bits. The CNC End Mill Router Bits apply to wood: such as Plywood, OAK, MDF, and any hardwood working and Long service life for sharp. And also for carbon steel, soft alloy steel, tool steel, cast iron, aluminum alloy. The router bit suit for CNC router and any plunge routers with 1/4 inch collet. Material: Carbide colour: silver Package Contents: 1 x router bit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.