FrontTech 7pcs Insulated Electrical Screwdriver Set, Multi-functional Insulated Electrical Screwdriver Phillips and Flat Double Head Precision Black Finish Blades With Magnetic Tips Repair Tool Kit Cr-v steel with heat treatment, high hardness and good toughness and resistence Black finish blade with magnetic tips which could conveniently attracts screws Plastic blade cover and special material which makes it durable and not easily broken down With ergonomic TPR handle and button on it, it helps you to use very easily Insulated blades for Electrical applications. Working voltage: 500v