This handy tool is for both professional engine builders as well as the amateur. It is used to elongate the intake bolt holes on a Small Block Chevy intake manifold. These bolt holes are often misaligned due to block or cylinder head milling and need to be corrected for proper intake installation. This affordable tool is made from durable heat-treated steel. It clamps securely in place, locating off the existing bolt hole. Using a 7/16th drill bit and a hand drill, the tool guides the bit and elongates the holes in the manifold.