2021 Allen Engineering Pro446, 46" Walk-Behind Trowel, Allen Pro446 46" walk-behind trowel with Honda GX270 9hp engine, adjustable fine pitch handle, stationary guard ring, and lift hook., The Allen Engineering Pro446 comes standard with a 9hp class Honda Engine and lifting bale and can be equipped with either our Fine Pitch or newly redesigned Rapid Pitch handle. These trowels are built for the busiest job-sites.