410 mm Tersa system M42 HSS blade Long wearing Tersa system replacement blades Ultra sharp edge for a superior finish Same day shipping on most items Free technical support (800) 533-7117 American National Knife has been producing professional quality woodworking knives for over 30 years. Our "in-stock" inventory of planer and jointer knives is one of the largest in America and ships the same day in most cases. Our knives are produced only from professional quality solid M42 HSS steels and carbide.