BALL GROOVER SINGLE FLUTE TCT A range of single flute ball slot cutters designed for pipe and cable laying into timber and MDF. DESCRIPTION Important - cut neck slot first, do not run on neck but use a side fence or guide. NB The neck does not cut. Suggested cutters for neck slot: TTM716 for TTTSB127 neck diameter 6.5mm; TTM1020 for TTTSB254 neck diameter 9.5mm; TTM1325 for TTTSB32 neck diameter 12.7mm