Forged from premium chrome vanadium steel, plus heat treatment, rustproof and sturdy. The puller can easily and quickly remove broken or rusted screws, bolts and studs. Designed with deep and wide threads, long life. It can be used in combination with an electric drill. Ideal screw removal tool for home use and professional electrician. Features: 1. The puller can easily and quickly remove broken or rusted screws, bolts and studs. 2. Forged from premium chrome vanadium steel, plus heat treatment, rustproof and sturdy. 3. Designed with deep and wide threads, long life. 4. It can be used in combination with the drill power. 5. Ideal screw removal tool for household use and professional electrician. Specification: Condition: 100% brand new Material: chrome vanadium steel Quantity: 8 pieces Weight: approx. 762g / 26.9oz List of packages: Application range 4.0 mm 3-6mm 4.5mm 6-8mm 6.5mm 8-11mm 7.5mm 11-14mm 11.0mm 14-18mm 12.0mm 18-20mm 15.0mm 25-35mm 19, 4 mm 35-50mm List of packages: 8 * Screw extractors