Serrating / Grooving Tool - 'ST' Series Is a portable tool used to make grooves in ferrous and non ferrous tube sheets. Features of 'ST' Series Grooving Tool High production tool. Ideal for use where 1 tool is needed per bore size. High speed steel cryogenically treated tool bit ensures maximum life. Tool is ideally suited for CNC applications on account of 1 piece mandrel construction and short design.