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Reduce the height of GRS MicroBlock or MicroBlock XL jaws by 9.5 mm. Great with ID Ring Holder (856-0209). Same pin holes and threads as standard MicroBlock jaws. Thread nut is included. Ideal for microscope users. Diameter when together is 50mm (2") and 13mm (½") in height. Weighs approximately 0.5lbs. Made in USA.