1/2" 10pcs hex drive 1. material: CRV ,s2 and 50BV30 2. various surface finishing 3. heat treatment,drop forged 1. Professional 1/2" 10pcs hex drive2.Content:9pcs: 1/2" DR ... Surface finish: mirror finish, phosphating, chrome plated, electrophoresis, and Zinc.5. Process: heat treatment, drop forged.6. Special heat treatment for ... can follow to produce with best products and best costs. 1/2" hex drive