Designed For Reaming In Most Materials Like Wood, Metal And Steel. For Use In Most Materials Using All Types Of Equipment Including Screw Machines, Turret Lathes, Drill Presses, And Machining Centers. Smooth, Chatter-Free Action Necessary For Fine Finishes. It Is Recommended Over The Straight-Flute For More Difficult Materials, Better Surface Requirements, And Applications With An Interruption Such As A Keyway Or Cross Hole.