CTA Tools 33049 Pro-Thread Repair Kit (UNC) 1/4 - 20-Inches is designed to repair damaged threads in most automotive, motorcycle and outdoor power equipment systems. Coiled inserts create a permanent and wear-resistant thread in the parent material. Special oversize taps are to international specifications - standard taps cannot be used. This kit includes tap, installation tool and 3 inserts. It comes complete with multi-lingual instructions. Heavy-duty construction allows for strength and durability. Whether tuning up your '68 Corvette or changing the oil on a John Deere tractor, CTA can supply you with the tools needed to do the job. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.