This Kit has been upgraded and now contains a 12" Cobalt M42 drill bit for faster and easier drilling. This is not offered on competitors kits and still at the same low price! For GM and Ford integral rear ends. The problem of removing broken differential pinion shaft lock bolts in GM and Ford integral rear ends has an easy solution. This extractor kit has been specifically designed for this purpose and is now available. It comes with everything needed, so a standard drilling and extracting procedure can be accomplished in approximately five minutes