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 (). 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.