QUALITY MATERIALS FOR OUTSTANDING PERFORMANCE. Produced by following state-of-the-art processes and by using high-tech machines, these jig saw blades have been specifically designed for precise cuts. BIMETAL: Suitable for use in hardwood, abrasive wooden and harder materials. This special bond of High Carbon Steel (HCS) and High Speed Steel (HSS) fits the most diverse needs. Appropriate to avoid any shank breakage thanks to its flexibility, this material lasts much longer than HCS and HSS. An excellent value for your money. GROUND AND TAPER GROUND TEETH: Geometry is important! This geometry delivers fine and clear cuts in woods and plastics.