High Speed Steel (HSS) blades are superior to High Carbon Steel (HCS) blades. HSS blades have a higher cutting performance and are more durable due to their rigidity and higher frictional temperature capability.
HSS blades are designed for sawing Plastics and Wood (up to 50mm), soft Copper pipe (AS/NZS 1571 pipe standard only) and very thin soft metals (including Aluminium and Copper) up to 2mm.
Offset blades are not made flush to the multi function tool attachment. Their design has an offset which raises the position of the multi tool to the cutting plain. Flat blades are not offset at the attachment, they are completely flat.