If you look at the pagethe Axminster aw2260s for the helical blades
https://www.axminstertools.com/axmi...s-planer-thicknesser-spiral-block-230v-108512
It is a spiral block and not a helical block, difference is that the spiral block cutters are in the same plane as the drum whereas the helical block cutters are angled to the drum and so cut with a shearing action like a guilotine.