Feature: 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 Specification: Item Type: Damaged Screw Extractor Material: High speed steel Damaged Screw Extractor Specification: Dr#1, Dr#2, Dr#3, Dr#4, Dr#5, Ex#1, Ex#2, Ex#3, Ex#4, Ex#5 Handle Diameter: Approx. 6.35mm / 0.3in Dr#6, Dr#7, Dr#8, Dr#9, Dr#10, Ex#6, Ex#7, Ex#8, Ex#9, Ex#10 Handle Diameter: Approx. 4mm / 0.2in Conversion Rod Size: Approx. 25mm / 1in. Package List: 20 x Screw Extractor1 x Conversion Rod1 x Black Knurled Rod Note: 1. The hole must be drilled when the surface of the broken screw is smooth. Otherwise the drill bit will slip.2. When drilling, it must be vertical and low speed. Use this drill in the reverse direction, the first hole is drilled deeper and easier to take out.3. Please allow tiny size error due to manual measurement.