Red capped aluminium cocktail shaker juicer
 
Description Red capped aluminium cocktail shaker top with built-in juicer
Material Metal - aluminium
Diameter External: 100 mm, Internal: 94 mm
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Height  
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Maker Not known. Possibly Viko.
Mary Walker No. Not listed
Notes Top of a cocktail shaker.
I have a few of these all without bases suggesting that it may have been a stand-alone top to sit on any glass and/or part of a bar set.
Alternatively, it would not be beyond reason to say that the bases were broken or not known to be part of a set.