These professional grade screwdrivers are designed for ease of use, comfort, and lasting durability. This set provides the two most common sizes required to for bicycles. Backed by Pedro's lifetime warranty. Features: Dual-density, ergonomic thermoplastic handles for comfortable grip and leverage Heat-treated tool steel construction for strength and durability Specs: Tip Size#2 Tip Size6.5mm Tip Size#1 Tip Size5.5mm Tip Size4.5mm Substitutes: TL8328