The STDXXX screed is perfect for doing small to intermediate size slabs, including irregular shapes and V-shaped waterways. It features a 3.5-hp gasoline engine, and it spans from 3 to 20 feet. The handle design transfers pull to the rear of the machine, eliminating much of the lifting. The screed is also available with a 4-hp engine. Kelly Screedmatic Mfg. Inc., 800-333-4980,