Tool bits coated with Titanium Nitride to give 3 times the life of conventional tool bits.Ideal for quick facing of projecting tube ends in heat exchangers, condensers and boilers.One size of tool is suitable for use on multiple tube thicknesses by interchanging pilot. (TEF-375 is the exception with the tool suitable for one tube ID only).Each tool is supplied with a set of multiple pilots to cover all tube thicknesses.