This Robert Sorby double ended cutter is spring loaded into a chatter tool, giving a unique decorative pattern to end grain only. Alternate patterns are achieved by Adjusting cutter lengths, Changing cutter shape, Altering lathe speed, Traverse or stationary cuts, and Cuts on, above or below centre. The Robert Sorby chattertool is RSB-RS215KT or RSB-RS216. Sharpening of this cutter is done across the top face using a diamond file of honing stone. Regular honing will maintain the cutter, therefore extending its useable life.