Chrome Plated Shafts and Blades for Increased Corrosion Resistance. Blade Tips are Designed to Ensure Tighter Tolerance and Fit While Adding Convenience when Starting Fasteners. Ergonomic Tri-Lobe Extruded Acetate Handles Provide Increased Comfort and Maximized Torque for Driving and Loosening Fasteners. Easy to Clean, Chemical-Resistant Acetate Handle Stands Up to All Conditions. Phillips Screwdrivers Feature Round Blades. 4 piece set.