16198 Titan #8 Spiral Flute Screw Extractor. #8 Spiral Screw Extractor #8 Spiral Use to Remove These Screws and Bolts 1-1/8" - 1-1/4", 28mm - 32mm 1Pre-Drill 3/16". Designed To Remove Broken Studs, Bolts And Screws. Aggressive Left Hand Spiral Design For Extra Gripping Power. Spiral Flutes Are Designed To Embed Themselves Deeper Into The Metal As You Turn The Tool.