... outer box material: hard plastic box surfaceProduct Features:The Screwdriver Set precision workmanship, good quality, head high hardness, ... torque. Particularly environmentally friendly plastic,comfortable operation.3. Screwdriver rod made from senior chrome vanadium steel, hardened ... size highest accuracy. Quality and wear resistance are the best.Tool screwdriver purpose:Star Hex (Plum Hex): T4, T5, ...