1、Durable High Speed Steel: Made of good quality high speed steel material, possess high hardness, durable, easy to remove damaged screws 2、Various Types: This set contain various types, easy to use, equipped with storage box for convenient carry 3、For Stripped, Broken or Damaged Bolts: Suitable for stripped, broken or damaged hex socket bolts, machine screws, square head bolts, wood screws, sheet metal screws, round head bolts and other screws, very practical 4、With Conversion Rods: Comes with conversion rods, convenient for you to use, greatly improves working efficiency 5、Smooth Surface: Using advanced technology with excellent craftsmanship to bring smooth surface, which will not hurt your hands in operate