Product Specification Package includes 5 Pcs screw extractors No.1: M4-M6 (1/8"-1/4") No.2: M6-M8 (1/4"-5/16") No.3: M8-M11 (5/16"-7/16") No.4: M11-M14 (7/16"-9/16") No.5: M14-M18 (9/16"-3/4") User Instruction How to use Step 1: First hit the center hole with a punch in the middle of the broken bolt or damaged screw Step 2: Select the correct size drill bit to drill holes in the center hole Step 3: Select the matching ratchet wrench or adjustable tap wrench to hold the corresponding screw extractor and insert it into the bottom of center hole Step 4: Turn the knob counter clockwise and gently screw out the screw
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