Single-Flute Cutting Edge For Greater Control Through Steps. 3 Flatted Shank Prevents Slipping In Drill Chuck. Also Available With Titanium Nitride Coating For Longer Life. Patented Single-Flute Cutting Edge Gives The User A True Round Hole Every Time. Ideal For Drilling Holes Into Thin Materials Such As Stainless Steel, Copper, Brass, Aluminum, Plastic And Laminates. Pilot Hole Required.