Each screwdriver in Mayhew Tools’ 8-Piece Slotted & Phillips Screwdriver Set (Part 27024T) is made in the United States and features an ergonomic acetate tri-lobular handle delivering maximum strength and torque transfer. Each tip is precision CNC machined to industry specifications with tight tolerances providing reliable fastener engagement. Tempered high alloy steel blades with black oxide finish to help prevent rust. Lifetime warranty included.