Exmark LZAS20BV484 Used 48" Lazer Z AS Zero-Turn Mower 20HP Briggs & Stratton Exmark's Lazer Z has been the standard of excellence for commercial zero-turn mowers. Today more than ever, the Lazer Z is coveted by landscape pros for its cut quality, productivity, durability and up-time performance. The improved design uses 40% fewer parts making it easier to maintain. Which means more profits for you.