<p>For removing the broken piece of heater element that can break off during glow plug removal. Works by drilling/tapping a thread into the broken element so the supplied glow plug adaptors can be used to extract.</p><br/><h4>Package Content:</h4><br/><ul><br/> <li>2 pcs Threaded Rods M4x0.7, length 180 mm</li><br/> <li>1 pc Threaded Rod M3x0.5, length 180 mm</li><br/> <li>HSS Drill 2.5 x 120mm &amp; HSS Drill 3.3mm x 140mm</li><br/> <li>Taps: M3 x 0.5, M4 x 0.7mm, length 100 mm</li><br/> <li>Drilling Guides: M8 x 1, M10 x 1, M10 x 1.25 mm</li><br/> <li>3 pcs Extractor Nuts</li><br/></ul>