Ergonomic acetate trilobe handle for maximum strength and torque transfer.Acetate is an extremely rugged impact and chemically resistant material, including being resistant to all sorts of common mechanical and automotive fluids.Ribbed design on neck for fingertip control and a no-slip grip.All blades are manufactured using Tempered high alloy steels.Each tip is precision CNC machined to industry specifications with tight tolerances for sure and reliable fastener engagement.They are concentric, true and straight with minimal run-outSets come in custom molded trays, designed to fit inside tool drawersCustom heat treat and temper process produces the perfect combination of hardness and ductility to achieve the strength, durability, and performance that the professional demands and appreciates.Smooth natural finish with Rust Preventative Coating for excellent corrosion resistanceSet includes 1/8, 3/16, 1/4 slotted and Phillips #0, 1, 2