Original Tersa HS M+ Planer Knives - 1 piece 500mm longORIGINAL Tersa planer knives in HS M+ high performance material with added Co. alloy. The upgraded material and edge geometry of these blades will give a better surface finish and a longer life than the standard HS grade knives. These knives are suitable for machining semi hard and soft wood. The knives are reversible with two cutting edges, reducing downtime and simplifying knife changes.