1/2" 28pcs chrome vanaidum socket set 1. material: CRV ,s2 and 50BV30 ... 3. heat treated 1. Professional 1/2" 28 pcs chrome vanaidum socket set2.Content:22pcs 1/2 " DR metric socket ... ,50BV30, CR-V 4. Surface finish: mirror finish, phosphating, chrome plated, electrophoresis, and Zinc.5. Process: heat treatment, drop forged.6 ... products and best costs. Professional 1/2" 28 pcs chrome vanadium socket set