Ultimate in high quality planning from the best possible quality HSS steel Set of 3 HSS Planer Blades for JET JPT310 High speed steel for sharper blades and longer service life Xcalibur Tooling's planer blades are made from HSS 18% Tungsten and hardened to 61-63 HRc for greater durability for cutting soft or hard wood. Xcalibur Tooling planer blades are supplied in a two part plastic sleeve and are very sharp 100% Quality Guaranteed, Weight: 1.212542441 pounds, Manufacturer: Xcalibur Tooling