The Bahco BAHCOFIT Robertson Tip screwdrivers are suitable for Robertson (square) screws. They have 2-component handles with vertical grooves for comfortable grip and maximum force transmission. The screwdrivers' blades are made from high performance alloy steel which is chrome plated and entirely hardened. The black finish tip provides higher accuracy. Each screwdriver has its part number and tip size laser printed for easier identification. Specifications Tip size #1. Blade length 100mm. Total length 195mm.