The Mayhew Tools 8-pc Slotted and Phillips Screwdriver Set, No. 27024T, features an ergonomic, acetate tri-lobular handle design for maximum strength and torque transfer as well as high alloy steel blades with a durable black oxide finish. Made with a custom heat-treatment and temper process for hardness and strength. Each tip is precision CNC machined to industry specifications with tight tolerances for sure and reliable fastener engagement. Made in U.S.A.