5 sizes, good easy guide to choosing screw size. Drill 7/64. Steps: 1. Use a center punch and a hammer to make a starting point in the broken bolt.2. Started drilling and spraying WD-40 from time to time to keep the drill happy.3. Drilled 1/4 to 1/3 inch deep.4. Insert bolt extractor by hand and turn by pressing until it clicks into place.5. Switched to the Cresent wrench, took my time and it worked. This is the first time I have broken a bolt in my 40 years as a home mechanic and this is the first puller I have ever used. Works perfectly, feels solid. I was surprised at how hard he digged into the broken bolt. Highly recommended!
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