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· EZ STUD OUT CATERPILLAR MASTER KIT allows you to quickly replace broken studs with no drilling or tapping. · Simply install our matching template to your cylinder head, weld a nut to the broken stud and unscrew. · Kit includes CATERPILLAR C12, C13 and C15 templates, 25 HD thin nuts, holding grease and a carbide burr all in a rugged and durable plastic case.