Now users can easily adjust the working height with these new StepRisers for MicroBlock. Reduce fatigue and increase efficiency, especially under a microscope. Each riser adds 0.5" (12.7 mm) to the working height of the GRS MicroBlock (#003-683). Designed for easy and secure stacking. The standard MicroBlock base fits the molded pocket in each riser, or the riser itself can be used as the base.