The teeth on Silky Saws are like super sharp little chisels that are dragged across the surface of a branch with each chisel taking a bite out of the wood it is cutting. Using Japanese ingenuity, saws cut on the pull stroke and to stop the saws binding they developed a process that is called among other things, taper or hollow grinding. What they did was get a big round grinding stone and ground their saw blades so the thickest part of the blade