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 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 moulded pocket in each riser, or the riser itself can be used as the base. Includes five individual 12.7 mm risers per package. MicroBlock (#003-683) is not included.