They technically are duller as they have a broader angle on the knife than the standard HSS ones which have a sharper angle. Doesn't make much difference when you're using a powerfed machine but if you're using them on an overhand planer it would make pushing timber across the blades a little harder work. The broader angle is ideal for hardwoods as it doesn't tend to rip out the fibres as much, but in softwoods it is pants compared to sharp standard HSS knives.memzey":21uy09mb said:I bought a set of the M42 ones for my machine from Woodford. They are pants. Seemed dull straight out of the packet. Just couldn’t get on with them. Have gone back to the HSS ones as they seem much better.