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I'm 6ft 1ins and purchased a set of these for me and my desk in the office is now the perfect height. The feet from the metal frame of the desk sit perfectly in each riser block and now raises my desk height by 25mm. My colleague is 6ft 4ins, so purchased three sets for him and he's sitting in a much better ergonomic position. Highly recommend this cheap and highly effective way to improve the way we work in our office. Thanks guys!