It’s name is Batu Giling – or a rolling stone grinder.
Long before there were electric blenders, this tool – in conjunction with the mortar & pestle – was used to grind up chilli, onions, garlic, belacan and other spices into a paste. The actual compositions would depend on what the end use was to be – what type of curries, for example. Every home had a set.
It required a fair bit of workout for the womenfolk as the rolling member was moved back and forth repeatedly. Hands would be roughened by the constant abrasion of the ends of the roller. But one Indian lady told me that it was good for the development of the chest…oops, is that true ?
note : The Rolling Stones was a British rock group of the 1960’s