Features: 100% brand new and high quality This tool will remove any stud, screw, pipes and bolts from 3mm to 25mm. Ideal tool for any professional or hobbyist. These extractors will remove most kinds of damaged, stripped, rusted, broken, or stuck screws from any wood or metal surface with relative ease. It can remove some of the common screwdriver can not be disassembled damaged bolts, screws, bolts and pipes. Made of high speed steel with additional hardness and durability. Suitable for wooden and mechanical screws, as well as flat, hexagonal or painted screws. Package Includes: 12 Pieces Broken Screw Extractor Remover Twist Drill Bit /Set Specifications: Material:High Speed Steel Mixed Size Bit Sizes Include: 3 / 32 , 1 / 8, 3 / 16 , 1 / 4, 5 / 16 , 3 / 8 note: Please allow 0-1cm errors due to manual measurement, make sure that you do not mind before you order.