Part # 60-241 Onsrud Router Bit for cutting soft/hard woods, plastic and solid surfaces. 
Professional quality router bit for CNC machines. 
It is a solid Carbide Bit with 3 flutes, upcut low helix
Cutting Diameter - 1/4"
Shank Diameter - 1/4"
Over all length - 3" 
Length of Cut - 7/8"