TC Replacement Tip for 'V' Grooving & Tracey Work With special programming, the TTVGC-RT range of cutters can produce a perfect right-angle corner. DESCRIPTION Using a normal angle cutter, the corners produced have a radius. With special programming, the TTVGC-RT range of cutters can produce a perfect right-angle corner. Reversible Knives are 12mm wide D mm and L mm values given are maximums.