This holder-knife combination instantly adapts to your machine without any modifications. First time Start Up System supplies the correct size Posi-Sets, one set of reusable Dispoz-A-Blade® knife holders & one set of double edge HSS Dispoz-A-Blade® knife inserts for your Grizzly machine. All that is required for future knife changes are economical double edge Dispoz-A-Blade® replacement knives.