"Experimenting with making approx 1cu m limecrete (NHL5). Large paddle mixing machines generally recommended for lime but limited budget so bought handheld mixer drill (1600W & low 1st gear). Drill came with 160mm dia paddle which overloaded at times. Bought a 140mm dia but with 3 helical blades - lighter to handle but still problematic. Then bought this one with two helical blades - this just keeps going and still handles the 20mm gravel in the mix. You still need to turn the edges of the mix in by hand to get everything mixed, but it's several times faster and a lot less effort than hand mixing and it won't clog up like conventional drum concrete mixers can with sticky lime. Cleaned up nicely at the end of the day."