IAG Performance 14mm Head Stud Dowel Pin Install Tool14mm head stud dowels can be a little tricky to install on your Subaru EJ engine. The steel dowel material is fairly thin and using a hammer to set them in place could cause them to distort enough that it requires replacement. The IAG 14mm head stud dowel tool was created to support the inner dowel walls evenly as it is tapped in place on the short block deck surface. Each tool is CNC machined from aluminum and features a silver anodized coating.