The PEG 25-50 boring tool is specially designed for use on aluminium cylinder heads with "cast-in" camshaft bearings. The tool will rebore camshaft bearing surfaces to any size with precision alignment, on warped cylinder heads or when the bearing surface must be filled or welded. The flexibility of the tool's design is such that it can be used on a wide range of cylinder head types. A simple fitting operation makes rapid rnovernent possible between heads of the same type.