Features 1、Made of high quality chrome vanadium alloy steel material which is durable and tough, a commonly used material in hardware. 2、These screwdriver bits have strong magnetism that can attract and hold screws firmly. 3、With 1/4 inch hex shaft, they are widely used on electric screwdrivers, hand screwdrivers, cordless drills, etc. 4、There are four screwdriver bit sizes of Y4, Y5,Y6, Y8 in this set. 5、Triangle-shaped screwdriver bit can drive screws in devices. Specification Features: 1. Made of high quality chrome vanadium alloy steel material which is durable and tough, a commonly used material in hardware. 2. These screwdriver bits have strong magnetism that can attract and hold screws firmly. 3. With 1/4 inch hex shaft, they are widely used on electric screwdrivers, hand screwdrivers, cordless drills, etc. 4. There are four screwdriver bit sizes of Y4, Y5,Y6, Y8 in this set. 5. Triangle-shaped screwdriver bit can drive screws in devices. Specification: Condition: 100% Brand New Material: Chrome Vanadium Alloy Steel Screw Head Type: Y-type Explosion Proof: Yes Type: Y4, Y5, Y6, Y8 Weight: Approx. 46g / 1.6oz Length : Approx. 50mm / 2.0in Package List: 4Pcs Screw Tools Package List