This is a Metric Precision Tool Screwdriver: #0 Phillips. FEATURES: Designed for use with Micro radio controlled vehicles that have Metric- type hardware. Precision drivers have hardened chrome vanadium shafts for extensive torquing. All drivers (except the nut drivers) have hardened tips. Rubberized handles are tapered for rapid turning ease. Textured finger grips offer comfort and a secure, slip-free hold. Rotating caps increase fingertip control.