The Mayhew Tools 4-pc Micro Torx Set, No. 31030, features an ergonomic micro handle design and high alloy steel blades with a black oxide finish. The set is made with a custom heat-treatment and temper process and each screwdriver's tip is precision CNC machined to industry specifications with tight tolerances for a more reliable fastener engagement. Measurements for these tools are 6" by 2", 7" by 2", 8" by 2-1/2", and 9" by 2-1/2".