Allen Engineering pioneered the use of floating discs (or pans) on riding trowels in 1989 and Allen® Pans remain today the finisher’s choice when high FF Numbers are specified on a concrete floor. Allen’s flat pan tolerances cut bumps and fill low spots in the concrete floor.  Insist on Allen® Steel Pans for your Allen Riders and Walk-Behinds. Made to the same exacting tolerances as the trowels themselves, nothing finishes better.